21957036466 has 16 divisors (see below), whose sum is σ = 33844035456. Its totient is φ = 10676012976.

The previous prime is 21957036421. The next prime is 21957036467. The reversal of 21957036466 is 66463075912.

It is a happy number.

It is a super-2 number, since 2×21957036466² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21957036467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58695 + ... + 217621.

It is an arithmetic number, because the mean of its divisors is an integer number (2115252216).

Almost surely, 2^21957036466 is an apocalyptic number.

21957036466 is a deficient number, since it is larger than the sum of its proper divisors (11886998990).

21957036466 is a wasteful number, since it uses less digits than its factorization.

21957036466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160833.

The product of its (nonzero) digits is 1632960, while the sum is 49.

It can be divided in two parts, 219570 and 36466, that added together give a square (256036 = 506²).

The spelling of 21957036466 in words is "twenty-one billion, nine hundred fifty-seven million, thirty-six thousand, four hundred sixty-six".