21150399504 has 120 divisors (see below), whose sum is σ = 59606726592. Its totient is φ = 6424254720.

The previous prime is 21150399497. The next prime is 21150399527. The reversal of 21150399504 is 40599305112.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3891669 + ... + 3897099.

Almost surely, 2^21150399504 is an apocalyptic number.

21150399504 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 21150399504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29803363296).

21150399504 is an abundant number, since it is smaller than the sum of its proper divisors (38456327088).

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

21150399504 is a wasteful number, since it uses less digits than its factorization.

21150399504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5613 (or 5528 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 39.

The spelling of 21150399504 in words is "twenty-one billion, one hundred fifty million, three hundred ninety-nine thousand, five hundred four".