21651628330 has 16 divisors (see below), whose sum is σ = 39019397760. Its totient is φ = 8650325392.

The previous prime is 21651628307. The next prime is 21651628343. The reversal of 21651628330 is 3382615612.

It is a self number, because there is not a number n which added to its sum of digits gives 21651628330.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281934 + ... + 1298713.

It is an arithmetic number, because the mean of its divisors is an integer number (2438712360).

Almost surely, 2^21651628330 is an apocalyptic number.

21651628330 is a deficient number, since it is larger than the sum of its proper divisors (17367769430).

21651628330 is a wasteful number, since it uses less digits than its factorization.

21651628330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581493.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 21651628330 in words is "twenty-one billion, six hundred fifty-one million, six hundred twenty-eight thousand, three hundred thirty".