121000010021 has 16 divisors (see below), whose sum is σ = 134555655168. Its totient is φ = 107872315200.

The previous prime is 121000010009. The next prime is 121000010029. The reversal of 121000010021 is 120010000121.

It is a cyclic number.

It is not a de Polignac number, because 121000010021 - 2⁶ = 121000009957 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121000009990 and 121000010008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000010029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1181555 + ... + 1279871.

It is an arithmetic number, because the mean of its divisors is an integer number (8409728448).

Almost surely, 2^121000010021 is an apocalyptic number.

121000010021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121000010021 is a deficient number, since it is larger than the sum of its proper divisors (13555645147).

121000010021 is a wasteful number, since it uses less digits than its factorization.

121000010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100492.

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

Adding to 121000010021 its reverse (120010000121), we get a palindrome (241010010142).

It can be divided in two parts, 1210000100 and 21, that added together give a palindrome (1210000121).

The spelling of 121000010021 in words is "one hundred twenty-one billion, ten thousand, twenty-one".