21167436452 has 96 divisors (see below), whose sum is σ = 40237731072. Its totient is φ = 9718765056.

The previous prime is 21167436427. The next prime is 21167436467. The reversal of 21167436452 is 25463476112.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 107448818 + ... + 107449014.

It is an arithmetic number, because the mean of its divisors is an integer number (419143032).

Almost surely, 2^21167436452 is an apocalyptic number.

It is an amenable number.

21167436452 is a deficient number, since it is larger than the sum of its proper divisors (19070294620).

21167436452 is a wasteful number, since it uses less digits than its factorization.

21167436452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597 (or 595 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

The spelling of 21167436452 in words is "twenty-one billion, one hundred sixty-seven million, four hundred thirty-six thousand, four hundred fifty-two".