21309472470336 has 224 divisors, whose sum is σ = 60127597296000. Its totient is φ = 6637366738944.

The previous prime is 21309472470289. The next prime is 21309472470337. The reversal of 21309472470336 is 63307427490312.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21309472470337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263857290 + ... + 263938038.

Almost surely, 2^{21309472470336} 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 21309472470336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30063798648000).

21309472470336 is an abundant number, since it is smaller than the sum of its proper divisors (38818124825664).

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

21309472470336 is a wasteful number, since it uses less digits than its factorization.

21309472470336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81361 (or 81351 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 51.

The spelling of 21309472470336 in words is "twenty-one trillion, three hundred nine billion, four hundred seventy-two million, four hundred seventy thousand, three hundred thirty-six".