85387998021 has 16 divisors (see below), whose sum is σ = 126892382400. Its totient is φ = 50756951808.

The previous prime is 85387997993. The next prime is 85387998029. The reversal of 85387998021 is 12089978358.

It is not a de Polignac number, because 85387998021 - 2⁹ = 85387997509 is a prime.

It is a super-2 number, since 2×85387998021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85387998029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44058886 + ... + 44060823.

It is an arithmetic number, because the mean of its divisors is an integer number (7930773900).

Almost surely, 2^85387998021 is an apocalyptic number.

It is an amenable number.

85387998021 is a deficient number, since it is larger than the sum of its proper divisors (41504384379).

85387998021 is a wasteful number, since it uses less digits than its factorization.

85387998021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88119748.

The product of its (nonzero) digits is 8709120, while the sum is 60.

The spelling of 85387998021 in words is "eighty-five billion, three hundred eighty-seven million, nine hundred ninety-eight thousand, twenty-one".