21272650 has 24 divisors (see below), whose sum is σ = 45220320. Its totient is φ = 7293360.

The previous prime is 21272621. The next prime is 21272681. The reversal of 21272650 is 5627212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30040 + ... + 30739.

It is an arithmetic number, because the mean of its divisors is an integer number (1884180).

Almost surely, 2^21272650 is an apocalyptic number.

21272650 is an abundant number, since it is smaller than the sum of its proper divisors (23947670).

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

21272650 is a wasteful number, since it uses less digits than its factorization.

21272650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60798 (or 60793 counting only the distinct ones).

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

The square root of 21272650 is about 4612.2283117816. The cubic root of 21272650 is about 277.0812882934.

Adding to 21272650 its reverse (5627212), we get a palindrome (26899862).

The spelling of 21272650 in words is "twenty-one million, two hundred seventy-two thousand, six hundred fifty".