1212121021101 has 8 divisors (see below), whose sum is σ = 1616780828160. Its totient is φ = 807770947392.

The previous prime is 1212121021049. The next prime is 1212121021117. The reversal of 1212121021101 is 1011201212121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1212121021101 - 2⁷ = 1212121020973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212121021901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77424205 + ... + 77439858.

It is an arithmetic number, because the mean of its divisors is an integer number (202097603520).

Almost surely, 2^{1212121021101} is an apocalyptic number.

It is an amenable number.

1212121021101 is a deficient number, since it is larger than the sum of its proper divisors (404659807059).

1212121021101 is a wasteful number, since it uses less digits than its factorization.

1212121021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154866675.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1212121021101 its reverse (1011201212121), we get a palindrome (2223322233222).

The spelling of 1212121021101 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, twenty-one thousand, one hundred one".