21964727651 has 16 divisors (see below), whose sum is σ = 23503385088. Its totient is φ = 20453760000.

The previous prime is 21964727639. The next prime is 21964727671. The reversal of 21964727651 is 15672746912.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21964727651 - 2¹⁴ = 21964711267 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21964727651.

It is not an unprimeable number, because it can be changed into a prime (21964727671) 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 15 ways as a sum of consecutive naturals, for example, 3088766 + ... + 3095868.

It is an arithmetic number, because the mean of its divisors is an integer number (1468961568).

Almost surely, 2^21964727651 is an apocalyptic number.

21964727651 is a deficient number, since it is larger than the sum of its proper divisors (1538657437).

21964727651 is a wasteful number, since it uses less digits than its factorization.

21964727651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9022.

The product of its digits is 1270080, while the sum is 50.

The spelling of 21964727651 in words is "twenty-one billion, nine hundred sixty-four million, seven hundred twenty-seven thousand, six hundred fifty-one".