21473129376 has 192 divisors, whose sum is σ = 67709980800. Its totient is φ = 6597531648.

The previous prime is 21473129347. The next prime is 21473129401. The reversal of 21473129376 is 67392137412.

21473129376 is a `hidden beast` number, since 21 + 473 + 1 + 2 + 93 + 76 = 666.

It is a super-2 number, since 2×21473129376² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 589716 + ... + 625068.

It is an arithmetic number, because the mean of its divisors is an integer number (352656150).

Almost surely, 2^21473129376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21473129376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33854990400).

21473129376 is an abundant number, since it is smaller than the sum of its proper divisors (46236851424).

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

21473129376 is a wasteful number, since it uses less digits than its factorization.

21473129376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35428 (or 35414 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The spelling of 21473129376 in words is "twenty-one billion, four hundred seventy-three million, one hundred twenty-nine thousand, three hundred seventy-six".