21473907600 has 240 divisors, whose sum is σ = 70685993664. Its totient is φ = 5569536000.

The previous prime is 21473907599. The next prime is 21473907601. The reversal of 21473907600 is 670937412.

It is an interprime number because it is at equal distance from previous prime (21473907599) and next prime (21473907601).

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×21473907600² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21473907601) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14498860 + ... + 14500340.

Almost surely, 2^21473907600 is an apocalyptic number.

21473907600 is a gapful number since it is divisible by the number (20) 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 21473907600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35342996832).

21473907600 is an abundant number, since it is smaller than the sum of its proper divisors (49212086064).

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

21473907600 is a wasteful number, since it uses less digits than its factorization.

21473907600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826 (or 1815 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 39.

The spelling of 21473907600 in words is "twenty-one billion, four hundred seventy-three million, nine hundred seven thousand, six hundred".