20210210221972 has 6 divisors (see below), whose sum is σ = 35367867888458. Its totient is φ = 10105105110984.

The previous prime is 20210210221843. The next prime is 20210210221973. The reversal of 20210210221972 is 27912201201202.

It can be written as a sum of positive squares in only one way, i.e., 17139318481156 + 3070891740816 = 4139966^2 + 1752396^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210210221973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2526276277743 + ... + 2526276277750.

Almost surely, 2^{20210210221972} is an apocalyptic number.

It is an amenable number.

20210210221972 is a deficient number, since it is larger than the sum of its proper divisors (15157657666486).

20210210221972 is a wasteful number, since it uses less digits than its factorization.

20210210221972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5052552555497 (or 5052552555495 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The spelling of 20210210221972 in words is "twenty trillion, two hundred ten billion, two hundred ten million, two hundred twenty-one thousand, nine hundred seventy-two".