1021000010121 has 48 divisors (see below), whose sum is σ = 1827131953920. Its totient is φ = 534982838400.

The previous prime is 1021000010113. The next prime is 1021000010123. The reversal of 1021000010121 is 1210100001201.

It is a happy number.

It is not a de Polignac number, because 1021000010121 - 2³ = 1021000010113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1021000010123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4004286 + ... + 4251623.

It is an arithmetic number, because the mean of its divisors is an integer number (38065249040).

Almost surely, 2^{1021000010121} is an apocalyptic number.

It is an amenable number.

1021000010121 is a deficient number, since it is larger than the sum of its proper divisors (806131943799).

1021000010121 is a wasteful number, since it uses less digits than its factorization.

1021000010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8256086 (or 8256083 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1021000010121 its reverse (1210100001201), we get a palindrome (2231100011322).

The spelling of 1021000010121 in words is "one trillion, twenty-one billion, ten thousand, one hundred twenty-one".