21651652 has 12 divisors (see below), whose sum is σ = 41335056. Its totient is φ = 9841640.

The previous prime is 21651607. The next prime is 21651667. The reversal of 21651652 is 25615612.

It is a self number, because there is not a number n which added to its sum of digits gives 21651652.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245998 + ... + 246085.

It is an arithmetic number, because the mean of its divisors is an integer number (3444588).

Almost surely, 2^21651652 is an apocalyptic number.

21651652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21651652 is a deficient number, since it is larger than the sum of its proper divisors (19683404).

21651652 is a wasteful number, since it uses less digits than its factorization.

21651652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492098 (or 492096 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 21651652 is about 4653.1335678229. The cubic root of 21651652 is about 278.7171415886.

The spelling of 21651652 in words is "twenty-one million, six hundred fifty-one thousand, six hundred fifty-two".