101421431 has 4 divisors (see below), whose sum is σ = 101441664. Its totient is φ = 101401200.

The previous prime is 101421427. The next prime is 101421443. The reversal of 101421431 is 134124101.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 101421431 - 2² = 101421427 is a prime.

It is a super-2 number, since 2×101421431² = 20572613332175522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101421401) 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, 3626 + ... + 14696.

It is an arithmetic number, because the mean of its divisors is an integer number (25360416).

Almost surely, 2^101421431 is an apocalyptic number.

101421431 is a deficient number, since it is larger than the sum of its proper divisors (20233).

101421431 is an equidigital number, since it uses as much as digits as its factorization.

101421431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20232.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 101421431 is about 10070.8207709203. The cubic root of 101421431 is about 466.3477774365.

Adding to 101421431 its reverse (134124101), we get a palindrome (235545532).

The spelling of 101421431 in words is "one hundred one million, four hundred twenty-one thousand, four hundred thirty-one".