21144366610 has 32 divisors (see below), whose sum is σ = 39408560640. Its totient is φ = 8158573248.

The previous prime is 21144366599. The next prime is 21144366613. The reversal of 21144366610 is 1666344112.

It is not an unprimeable number, because it can be changed into a prime (21144366613) 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, 286819 + ... + 352921.

It is an arithmetic number, because the mean of its divisors is an integer number (1231517520).

Almost surely, 2^21144366610 is an apocalyptic number.

21144366610 is a deficient number, since it is larger than the sum of its proper divisors (18264194030).

21144366610 is a wasteful number, since it uses less digits than its factorization.

21144366610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67242.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 21144366610 in words is "twenty-one billion, one hundred forty-four million, three hundred sixty-six thousand, six hundred ten".