1021121221100 has 36 divisors (see below), whose sum is σ = 2237772013008. Its totient is φ = 404404440000.

The previous prime is 1021121221093. The next prime is 1021121221129. The reversal of 1021121221100 is 11221211201.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50540456 + ... + 50560655.

Almost surely, 2^{1021121221100} is an apocalyptic number.

1021121221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021121221100 is an abundant number, since it is smaller than the sum of its proper divisors (1216650791908).

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

1021121221100 is a wasteful number, since it uses less digits than its factorization.

1021121221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101101226 (or 101101219 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021121221100 its reverse (11221211201), we get a palindrome (1032342432301).

It can be divided in two parts, 1021 and 121221100, that added together give a palindrome (121222121).

The spelling of 1021121221100 in words is "one trillion, twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred".