210021111221020 has 48 divisors (see below), whose sum is σ = 488320456192128. Its totient is φ = 75231442820160.

The previous prime is 210021111221011. The next prime is 210021111221039. The reversal of 210021111221020 is 20122111120012.

It is a junction number, because it is equal to n+sod(n) for n = 210021111220985 and 210021111221003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7124174922 + ... + 7124204401.

It is an arithmetic number, because the mean of its divisors is an integer number (10173342837336).

Almost surely, 2^{210021111221020} is an apocalyptic number.

210021111221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021111221020 is an abundant number, since it is smaller than the sum of its proper divisors (278299344971108).

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

210021111221020 is a wasteful number, since it uses less digits than its factorization.

210021111221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14248379410 (or 14248379408 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210021111221020 its reverse (20122111120012), we get a palindrome (230143222341032).

The spelling of 210021111221020 in words is "two hundred ten trillion, twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, twenty".