21210212012022 has 96 divisors (see below), whose sum is σ = 50231595757824. Its totient is φ = 6414729681600.

The previous prime is 21210212012009. The next prime is 21210212012039. The reversal of 21210212012022 is 22021021201212.

It is a happy number.

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 = 21210212011986 and 21210212012004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 883489143 + ... + 883513149.

It is an arithmetic number, because the mean of its divisors is an integer number (523245789144).

Almost surely, 2^{21210212012022} is an apocalyptic number.

21210212012022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21210212012022 is an abundant number, since it is smaller than the sum of its proper divisors (29021383745802).

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

21210212012022 is a wasteful number, since it uses less digits than its factorization.

21210212012022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32594 (or 32591 counting only the distinct ones).

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

Adding to 21210212012022 its reverse (22021021201212), we get a palindrome (43231233213234).

The spelling of 21210212012022 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, twelve thousand, twenty-two".