21275202072 has 32 divisors (see below), whose sum is σ = 53192905200. Its totient is φ = 7091080704.

The previous prime is 21275202029. The next prime is 21275202073. The reversal of 21275202072 is 27020257212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275202073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274948 + ... + 343724.

Almost surely, 2^21275202072 is an apocalyptic number.

It is an amenable number.

21275202072 is an abundant number, since it is smaller than the sum of its proper divisors (31917703128).

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

21275202072 is a wasteful number, since it uses less digits than its factorization.

21275202072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81675 (or 81671 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

Adding to 21275202072 its reverse (27020257212), we get a palindrome (48295459284).

The spelling of 21275202072 in words is "twenty-one billion, two hundred seventy-five million, two hundred two thousand, seventy-two".