21439557007 has 8 divisors (see below), whose sum is σ = 23932529280. Its totient is φ = 19037238360.

The previous prime is 21439556977. The next prime is 21439557037. The reversal of 21439557007 is 70075593412.

It is an interprime number because it is at equal distance from previous prime (21439556977) and next prime (21439557037).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21439557007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21439557037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22662907 + ... + 22663852.

It is an arithmetic number, because the mean of its divisors is an integer number (2991566160).

Almost surely, 2^21439557007 is an apocalyptic number.

21439557007 is a deficient number, since it is larger than the sum of its proper divisors (2492972273).

21439557007 is a wasteful number, since it uses less digits than its factorization.

21439557007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45326813.

The product of its (nonzero) digits is 264600, while the sum is 43.

The spelling of 21439557007 in words is "twenty-one billion, four hundred thirty-nine million, five hundred fifty-seven thousand, seven".