101005581221 has 4 divisors (see below), whose sum is σ = 101092431552. Its totient is φ = 100918730892.

The previous prime is 101005581211. The next prime is 101005581269. The reversal of 101005581221 is 122185500101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 101005581221 - 2²⁶ = 100938472357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101005581211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43423421 + ... + 43425746.

It is an arithmetic number, because the mean of its divisors is an integer number (25273107888).

Almost surely, 2^101005581221 is an apocalyptic number.

It is an amenable number.

101005581221 is a deficient number, since it is larger than the sum of its proper divisors (86850331).

101005581221 is an equidigital number, since it uses as much as digits as its factorization.

101005581221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86850330.

The product of its (nonzero) digits is 800, while the sum is 26.

The spelling of 101005581221 in words is "one hundred one billion, five million, five hundred eighty-one thousand, two hundred twenty-one".