21377245258072 has 96 divisors (see below), whose sum is σ = 45726585186240. Its totient is φ = 9290182324800.

The previous prime is 21377245258021. The next prime is 21377245258079. The reversal of 21377245258072 is 27085254277312.

It is a super-2 number, since 2×21377245258072² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377245258079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5496363 + ... + 8541925.

It is an arithmetic number, because the mean of its divisors is an integer number (476318595690).

Almost surely, 2^{21377245258072} is an apocalyptic number.

21377245258072 is a gapful number since it is divisible by the number (22) 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 21377245258072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22863292593120).

21377245258072 is an abundant number, since it is smaller than the sum of its proper divisors (24349339928168).

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

21377245258072 is a wasteful number, since it uses less digits than its factorization.

21377245258072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045725 (or 3045690 counting only the distinct ones).

The product of its (nonzero) digits is 13171200, while the sum is 55.

The spelling of 21377245258072 in words is "twenty-one trillion, three hundred seventy-seven billion, two hundred forty-five million, two hundred fifty-eight thousand, seventy-two".