21505376150400 has 96 divisors (see below), whose sum is σ = 70833332727000. Its totient is φ = 5734766970880.

The previous prime is 21505376150387. The next prime is 21505376150431. The reversal of 21505376150400 is 405167350512.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1120062075 + ... + 1120081274.

Almost surely, 2^{21505376150400} is an apocalyptic number.

21505376150400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21505376150400 is an abundant number, since it is smaller than the sum of its proper divisors (49327956576600).

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

21505376150400 is a wasteful number, since it uses less digits than its factorization.

21505376150400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240143376 (or 2240143359 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 21505376150400 in words is "twenty-one trillion, five hundred five billion, three hundred seventy-six million, one hundred fifty thousand, four hundred".