20210221312 has 18 divisors (see below), whose sum is σ = 40341496958. Its totient is φ = 10105110528.

The previous prime is 20210221267. The next prime is 20210221337. The reversal of 20210221312 is 21312201202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17196650496 + 3013570816 = 131136^2 + 54896^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39472833 + ... + 39473344.

Almost surely, 2^20210221312 is an apocalyptic number.

It is an amenable number.

20210221312 is a deficient number, since it is larger than the sum of its proper divisors (20131275646).

20210221312 is an frugal number, since it uses more digits than its factorization.

20210221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78946193 (or 78946179 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20210221312 its reverse (21312201202), we get a palindrome (41522422514).

The spelling of 20210221312 in words is "twenty billion, two hundred ten million, two hundred twenty-one thousand, three hundred twelve".