101261243221 has 4 divisors (see below), whose sum is σ = 101262135744. Its totient is φ = 101260350700.

The previous prime is 101261243201. The next prime is 101261243249. The reversal of 101261243221 is 122342162101.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 122342162101 = 60647 ⋅2017283.

It is a cyclic number.

It is not a de Polignac number, because 101261243221 - 2²⁵ = 101227688789 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 (101261243201) 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, 246175 + ... + 512956.

It is an arithmetic number, because the mean of its divisors is an integer number (25315533936).

Almost surely, 2^101261243221 is an apocalyptic number.

It is an amenable number.

101261243221 is a deficient number, since it is larger than the sum of its proper divisors (892523).

101261243221 is an equidigital number, since it uses as much as digits as its factorization.

101261243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892522.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 101261243221 in words is "one hundred one billion, two hundred sixty-one million, two hundred forty-three thousand, two hundred twenty-one".