21020282272 has 48 divisors (see below), whose sum is σ = 45159049152. Its totient is φ = 9551877120.

The previous prime is 21020282267. The next prime is 21020282287. The reversal of 21020282272 is 27228202012.

It is a self number, because there is not a number n which added to its sum of digits gives 21020282272.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632853 + ... + 1645675.

It is an arithmetic number, because the mean of its divisors is an integer number (940813524).

Almost surely, 2^21020282272 is an apocalyptic number.

21020282272 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21020282272 is an abundant number, since it is smaller than the sum of its proper divisors (24138766880).

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

21020282272 is a wasteful number, since it uses less digits than its factorization.

21020282272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17501 (or 17493 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

Adding to 21020282272 its reverse (27228202012), we get a palindrome (48248484284).

The spelling of 21020282272 in words is "twenty-one billion, twenty million, two hundred eighty-two thousand, two hundred seventy-two".