21213221022 has 72 divisors (see below), whose sum is σ = 54066916800. Its totient is φ = 5992797888.

The previous prime is 21213221017. The next prime is 21213221053. The reversal of 21213221022 is 22012231212.

21213221022 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21213221022² (a number of 21 digits) contains 22 as substring.

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 = 21213220986 and 21213221004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 56622 + ... + 213617.

It is an arithmetic number, because the mean of its divisors is an integer number (750929400).

Almost surely, 2^21213221022 is an apocalyptic number.

21213221022 is an abundant number, since it is smaller than the sum of its proper divisors (32853695778).

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

21213221022 is a wasteful number, since it uses less digits than its factorization.

21213221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270350 (or 270340 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21213221022 its reverse (22012231212), we get a palindrome (43225452234).

The spelling of 21213221022 in words is "twenty-one billion, two hundred thirteen million, two hundred twenty-one thousand, twenty-two".