1021000022121 has 16 divisors (see below), whose sum is σ = 1361920003200. Its totient is φ = 680373445248.

The previous prime is 1021000022117. The next prime is 1021000022137. The reversal of 1021000022121 is 1212200001201.

It is not a de Polignac number, because 1021000022121 - 2² = 1021000022117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021000022097 and 1021000022106.

It is not an unprimeable number, because it can be changed into a prime (1021000026121) 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, 131619175 + ... + 131626931.

It is an arithmetic number, because the mean of its divisors is an integer number (85120000200).

Almost surely, 2^{1021000022121} is an apocalyptic number.

It is an amenable number.

1021000022121 is a deficient number, since it is larger than the sum of its proper divisors (340919981079).

1021000022121 is an equidigital number, since it uses as much as digits as its factorization.

1021000022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21008.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1021000022121 its reverse (1212200001201), we get a palindrome (2233200023322).

The spelling of 1021000022121 in words is "one trillion, twenty-one billion, twenty-two thousand, one hundred twenty-one".