21121002211020 has 24 divisors (see below), whose sum is σ = 59138806191024. Its totient is φ = 5632267256256.

The previous prime is 21121002211013. The next prime is 21121002211069. The reversal of 21121002211020 is 2011220012112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176008351699 + ... + 176008351818.

It is an arithmetic number, because the mean of its divisors is an integer number (2464116924626).

Almost surely, 2^{21121002211020} is an apocalyptic number.

21121002211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121002211020 is an abundant number, since it is smaller than the sum of its proper divisors (38017803980004).

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

21121002211020 is a wasteful number, since it uses less digits than its factorization.

21121002211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352016703529 (or 352016703527 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21121002211020 its reverse (2011220012112), we get a palindrome (23132222223132).

The spelling of 21121002211020 in words is "twenty-one trillion, one hundred twenty-one billion, two million, two hundred eleven thousand, twenty".