101521015021 has 12 divisors (see below), whose sum is σ = 109363076640. Its totient is φ = 94203408320.

The previous prime is 101521015009. The next prime is 101521015039. The reversal of 101521015021 is 120510125101.

It is not a de Polignac number, because 101521015021 - 2⁵ = 101521014989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101521015021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101521015051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2453311 + ... + 2494348.

It is an arithmetic number, because the mean of its divisors is an integer number (9113589720).

Almost surely, 2^101521015021 is an apocalyptic number.

It is an amenable number.

101521015021 is a deficient number, since it is larger than the sum of its proper divisors (7842061619).

101521015021 is an equidigital number, since it uses as much as digits as its factorization.

101521015021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4947764 (or 4947747 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 19.

The spelling of 101521015021 in words is "one hundred one billion, five hundred twenty-one million, fifteen thousand, twenty-one".