21210220121022 has 32 divisors (see below), whose sum is σ = 47434037940000. Its totient is φ = 7025041056384.

The previous prime is 21210220121011. The next prime is 21210220121033. The reversal of 21210220121022 is 22012102201212.

It is a happy number.

21210220121022 is a `hidden beast` number, since 2 + 1 + 210 + 220 + 1 + 210 + 22 = 666.

It is an interprime number because it is at equal distance from previous prime (21210220121011) and next prime (21210220121033).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21210220120986 and 21210220121004.

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, 1250889147 + ... + 1250906102.

It is an arithmetic number, because the mean of its divisors is an integer number (1482313685625).

Almost surely, 2^{21210220121022} is an apocalyptic number.

21210220121022 is an abundant number, since it is smaller than the sum of its proper divisors (26223817818978).

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

21210220121022 is a wasteful number, since it uses less digits than its factorization.

21210220121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501795417 (or 2501795411 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21210220121022 its reverse (22012102201212), we get a palindrome (43222322322234).

The spelling of 21210220121022 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, one hundred twenty-one thousand, twenty-two".