21272031250 has 64 divisors (see below), whose sum is σ = 40283100000. Its totient is φ = 8424000000.

The previous prime is 21272031241. The next prime is 21272031257. The reversal of 21272031250 is 5213027212.

It can be written as a sum of positive squares in 16 ways, for example, as 21222371041 + 49660209 = 145679^2 + 7047^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21272031257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17030626 + ... + 17031874.

Almost surely, 2^21272031250 is an apocalyptic number.

21272031250 is a deficient number, since it is larger than the sum of its proper divisors (19011068750).

21272031250 is an frugal number, since it uses more digits than its factorization.

21272031250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395 (or 1365 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

Adding to 21272031250 its reverse (5213027212), we get a palindrome (26485058462).

The spelling of 21272031250 in words is "twenty-one billion, two hundred seventy-two million, thirty-one thousand, two hundred fifty".