21371503104 has 640 divisors, whose sum is σ = 76429393920. Its totient is φ = 5768921088.

The previous prime is 21371503099. The next prime is 21371503133. The reversal of 21371503104 is 40130517312.

21371503104 is a `hidden beast` number, since 21 + 37 + 1 + 503 + 104 = 666.

It is a super-2 number, since 2×21371503104² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 168279489 + ... + 168279615.

It is an arithmetic number, because the mean of its divisors is an integer number (119420928).

Almost surely, 2^21371503104 is an apocalyptic number.

21371503104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21371503104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38214696960).

21371503104 is an abundant number, since it is smaller than the sum of its proper divisors (55057890816).

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

21371503104 is a wasteful number, since it uses less digits than its factorization.

21371503104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The spelling of 21371503104 in words is "twenty-one billion, three hundred seventy-one million, five hundred three thousand, one hundred four".