121010101 has 4 divisors (see below), whose sum is σ = 123584832. Its totient is φ = 118435372.

The previous prime is 121010083. The next prime is 121010117. The reversal of 121010101 is 101010121.

121010101 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101010121 = 31 ⋅3258391.

It is a cyclic number.

It is not a de Polignac number, because 121010101 - 2¹¹ = 121008053 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

121010101 is a modest number, since divided by 10101 gives 121 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121010161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287295 + ... + 1287388.

It is an arithmetic number, because the mean of its divisors is an integer number (30896208).

Almost surely, 2^121010101 is an apocalyptic number.

It is an amenable number.

121010101 is a deficient number, since it is larger than the sum of its proper divisors (2574731).

121010101 is an equidigital number, since it uses as much as digits as its factorization.

121010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574730.

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 121010101 is about 11000.4591267819. The cubic root of 121010101 is about 494.6225071456.

Adding to 121010101 its reverse (101010121), we get a palindrome (222020222).

It can be divided in two parts, 1210 and 10101, that added together give a palindrome (11311).

The spelling of 121010101 in words is "one hundred twenty-one million, ten thousand, one hundred one".