21439152917530 has 32 divisors (see below), whose sum is σ = 38642573849040. Its totient is φ = 8564090757120.

The previous prime is 21439152917509. The next prime is 21439152917549. The reversal of 21439152917530 is 3571925193412.

It can be written as a sum of positive squares in 8 ways, for example, as 638830934361 + 20800321983169 = 799269^2 + 4560737^2 .

It is a super-2 number, since 2×21439152917530² (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 15 ways as a sum of consecutive naturals, for example, 23958322 + ... + 24837058.

Almost surely, 2^{21439152917530} is an apocalyptic number.

21439152917530 is a deficient number, since it is larger than the sum of its proper divisors (17203420931510).

21439152917530 is a wasteful number, since it uses less digits than its factorization.

21439152917530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882034.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The spelling of 21439152917530 in words is "twenty-one trillion, four hundred thirty-nine billion, one hundred fifty-two million, nine hundred seventeen thousand, five hundred thirty".