21084153772 has 24 divisors (see below), whose sum is σ = 40305226752. Its totient is φ = 9570930000.

The previous prime is 21084153709. The next prime is 21084153781. The reversal of 21084153772 is 27735148012.

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 7 ways as a sum of consecutive naturals, for example, 285988 + ... + 352075.

It is an arithmetic number, because the mean of its divisors is an integer number (1679384448).

Almost surely, 2^21084153772 is an apocalyptic number.

21084153772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21084153772 is a deficient number, since it is larger than the sum of its proper divisors (19221072980).

21084153772 is a wasteful number, since it uses less digits than its factorization.

21084153772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638829 (or 638827 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 21084153772 in words is "twenty-one billion, eighty-four million, one hundred fifty-three thousand, seven hundred seventy-two".