21275437443480 has 384 divisors, whose sum is σ = 77315020473600. Its totient is φ = 5030391168000.

The previous prime is 21275437443479. The next prime is 21275437443517. The reversal of 21275437443480 is 8434473457212.

21275437443480 is a `hidden beast` number, since 2 + 1 + 2 + 7 + 54 + 3 + 74 + 43 + 480 = 666.

It is a super-2 number, since 2×21275437443480² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 26400351 + ... + 27194289.

It is an arithmetic number, because the mean of its divisors is an integer number (201341199150).

Almost surely, 2^{21275437443480} is an apocalyptic number.

21275437443480 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 21275437443480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38657510236800).

21275437443480 is an abundant number, since it is smaller than the sum of its proper divisors (56039583030120).

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

21275437443480 is a wasteful number, since it uses less digits than its factorization.

21275437443480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794135 (or 794128 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 54.

The spelling of 21275437443480 in words is "twenty-one trillion, two hundred seventy-five billion, four hundred thirty-seven million, four hundred forty-three thousand, four hundred eighty".