21152660466 has 32 divisors (see below), whose sum is σ = 49908584448. Its totient is φ = 5848661520.

The previous prime is 21152660443. The next prime is 21152660483. The reversal of 21152660466 is 66406625112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8121840 + ... + 8124443.

It is an arithmetic number, because the mean of its divisors is an integer number (1559643264).

Almost surely, 2^21152660466 is an apocalyptic number.

21152660466 is an abundant number, since it is smaller than the sum of its proper divisors (28755923982).

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

21152660466 is a wasteful number, since it uses less digits than its factorization.

21152660466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16246326.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 21152660466 in words is "twenty-one billion, one hundred fifty-two million, six hundred sixty thousand, four hundred sixty-six".