20221321212 has 36 divisors (see below), whose sum is σ = 52303731480. Its totient is φ = 6583685472.

The previous prime is 20221321181. The next prime is 20221321249. The reversal of 20221321212 is 21212312202.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20221321212² (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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6529887 + ... + 6532982.

It is an arithmetic number, because the mean of its divisors is an integer number (1452881430).

Almost surely, 2^20221321212 is an apocalyptic number.

It is an amenable number.

20221321212 is an abundant number, since it is smaller than the sum of its proper divisors (32082410268).

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

20221321212 is a wasteful number, since it uses less digits than its factorization.

20221321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13062922 (or 13062917 counting only the distinct ones).

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

Adding to 20221321212 its reverse (21212312202), we get a palindrome (41433633414).

The spelling of 20221321212 in words is "twenty billion, two hundred twenty-one million, three hundred twenty-one thousand, two hundred twelve".