1021002021100 has 18 divisors (see below), whose sum is σ = 2215574386004. Its totient is φ = 408400808400.

The previous prime is 1021002021097. The next prime is 1021002021113. The reversal of 1021002021100 is 11202001201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5105010006 + ... + 5105010205.

Almost surely, 2^{1021002021100} is an apocalyptic number.

1021002021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021002021100 is an abundant number, since it is smaller than the sum of its proper divisors (1194572364904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021002021100 is a wasteful number, since it uses less digits than its factorization.

1021002021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210020225 (or 10210020218 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1021002021100 its reverse (11202001201), we get a palindrome (1032204022301).

The spelling of 1021002021100 in words is "one trillion, twenty-one billion, two million, twenty-one thousand, one hundred".