121010021 has 4 divisors (see below), whose sum is σ = 132010944. Its totient is φ = 110009100.

The previous prime is 121009997. The next prime is 121010033. The reversal of 121010021 is 120010121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121010021 - 2¹⁴ = 120993637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121009990 and 121010008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121010321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5500445 + ... + 5500466.

It is an arithmetic number, because the mean of its divisors is an integer number (33002736).

Almost surely, 2^121010021 is an apocalyptic number.

121010021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121010021 is a deficient number, since it is larger than the sum of its proper divisors (11000923).

121010021 is a wasteful number, since it uses less digits than its factorization.

121010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11000922.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 121010021 is about 11000.4554905695. The cubic root of 121010021 is about 494.6223981469.

Adding to 121010021 its reverse (120010121), we get a palindrome (241020142).

It can be divided in two parts, 1210100 and 21, that added together give a palindrome (1210121).

The spelling of 121010021 in words is "one hundred twenty-one million, ten thousand, twenty-one".