21399526329480 has 1536 divisors, whose sum is σ = 85086012211200. Its totient is φ = 4789028634624.

The previous prime is 21399526329449. The next prime is 21399526329523. The reversal of 21399526329480 is 8492362599312.

21399526329480 is a `hidden beast` number, since 2 + 1 + 3 + 9 + 9 + 5 + 263 + 294 + 80 = 666.

It is a super-2 number, since 2×21399526329480² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 7975968219 + ... + 7975970901.

It is an arithmetic number, because the mean of its divisors is an integer number (55394539200).

Almost surely, 2^{21399526329480} is an apocalyptic number.

21399526329480 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 21399526329480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42543006105600).

21399526329480 is an abundant number, since it is smaller than the sum of its proper divisors (63686485881720).

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

21399526329480 is a wasteful number, since it uses less digits than its factorization.

21399526329480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865 (or 2849 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 63.

The spelling of 21399526329480 in words is "twenty-one trillion, three hundred ninety-nine billion, five hundred twenty-six million, three hundred twenty-nine thousand, four hundred eighty".