20211222132 has 18 divisors (see below), whose sum is σ = 51089478258. Its totient is φ = 6737074032.

The previous prime is 20211222121. The next prime is 20211222173. The reversal of 20211222132 is 23122211202.

It can be written as a sum of positive squares in only one way, i.e., 20162864016 + 48358116 = 141996^2 + 6954^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 5 ways as a sum of consecutive naturals, for example, 280711383 + ... + 280711454.

Almost surely, 2^20211222132 is an apocalyptic number.

It is an amenable number.

20211222132 is an abundant number, since it is smaller than the sum of its proper divisors (30878256126).

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

20211222132 is a wasteful number, since it uses less digits than its factorization.

20211222132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561422847 (or 561422842 counting only the distinct ones).

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

Adding to 20211222132 its reverse (23122211202), we get a palindrome (43333433334).

The spelling of 20211222132 in words is "twenty billion, two hundred eleven million, two hundred twenty-two thousand, one hundred thirty-two".