31240401222021 has 4 divisors (see below), whose sum is σ = 41653868296032. Its totient is φ = 20826934148012.

The previous prime is 31240401221969. The next prime is 31240401222029. The reversal of 31240401222021 is 12022210404213.

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 31240401222021 - 2²⁵ = 31240367667589 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31240401221982 and 31240401222000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240401222029) 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, 5206733537001 + ... + 5206733537006.

It is an arithmetic number, because the mean of its divisors is an integer number (10413467074008).

Almost surely, 2^{31240401222021} is an apocalyptic number.

It is an amenable number.

31240401222021 is a deficient number, since it is larger than the sum of its proper divisors (10413467074011).

31240401222021 is a wasteful number, since it uses less digits than its factorization.

31240401222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10413467074010.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 31240401222021 its reverse (12022210404213), we get a palindrome (43262611626234).

The spelling of 31240401222021 in words is "thirty-one trillion, two hundred forty billion, four hundred one million, two hundred twenty-two thousand, twenty-one".