101431921 has 4 divisors (see below), whose sum is σ = 101455732. Its totient is φ = 101408112.

The previous prime is 101431871. The next prime is 101431931. The reversal of 101431921 is 129134101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41152225 + 60279696 = 6415^2 + 7764^2 .

It is a cyclic number.

It is not a de Polignac number, because 101431921 - 2⁹ = 101431409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101431892 and 101431901.

It is not an unprimeable number, because it can be changed into a prime (101431931) 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, 3570 + ... + 14683.

It is an arithmetic number, because the mean of its divisors is an integer number (25363933).

Almost surely, 2^101431921 is an apocalyptic number.

It is an amenable number.

101431921 is a deficient number, since it is larger than the sum of its proper divisors (23811).

101431921 is an equidigital number, since it uses as much as digits as its factorization.

101431921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23810.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 101431921 is about 10071.3415690264. The cubic root of 101431921 is about 466.3638549706.

The spelling of 101431921 in words is "one hundred one million, four hundred thirty-one thousand, nine hundred twenty-one".