20021021111210 has 16 divisors (see below), whose sum is σ = 41186100571776. Its totient is φ = 6864350095248.

The previous prime is 20021021111207. The next prime is 20021021111261. The reversal of 20021021111210 is 1211112012002.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143007293582 + ... + 143007293721.

It is an arithmetic number, because the mean of its divisors is an integer number (2574131285736).

Almost surely, 2^{20021021111210} is an apocalyptic number.

20021021111210 is an abundant number, since it is smaller than the sum of its proper divisors (21165079460566).

20021021111210 is a wasteful number, since it uses less digits than its factorization.

20021021111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286014587317.

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

Adding to 20021021111210 its reverse (1211112012002), we get a palindrome (21232133123212).

The spelling of 20021021111210 in words is "twenty trillion, twenty-one billion, twenty-one million, one hundred eleven thousand, two hundred ten".