101012321988 has 36 divisors (see below), whose sum is σ = 255398858988. Its totient is φ = 33662577600.

The previous prime is 101012321957. The next prime is 101012321989. The reversal of 101012321988 is 889123210101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 81749102724 + 19263219264 = 285918^2 + 138792^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (101012321989) 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 11 ways as a sum of consecutive naturals, for example, 190663 + ... + 488238.

Almost surely, 2^101012321988 is an apocalyptic number.

101012321988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

101012321988 is an abundant number, since it is smaller than the sum of its proper divisors (154386537000).

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

101012321988 is a wasteful number, since it uses less digits than its factorization.

101012321988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683044 (or 683039 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The spelling of 101012321988 in words is "one hundred one billion, twelve million, three hundred twenty-one thousand, nine hundred eighty-eight".