31261400431221 has 8 divisors (see below), whose sum is σ = 41743801668160. Its totient is φ = 20809966407552.

The previous prime is 31261400431207. The next prime is 31261400431259. The reversal of 31261400431221 is 12213400416213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31261400431221 - 2³⁹ = 30711644617333 is a prime.

It is a super-2 number, since 2×31261400431221² (a number of 28 digits) 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 (31261400439221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7741800961 + ... + 7741804998.

It is an arithmetic number, because the mean of its divisors is an integer number (5217975208520).

Almost surely, 2^{31261400431221} is an apocalyptic number.

It is an amenable number.

31261400431221 is a deficient number, since it is larger than the sum of its proper divisors (10482401236939).

31261400431221 is a wasteful number, since it uses less digits than its factorization.

31261400431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15483606635.

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 31261400431221 its reverse (12213400416213), we get a palindrome (43474800847434).

The spelling of 31261400431221 in words is "thirty-one trillion, two hundred sixty-one billion, four hundred million, four hundred thirty-one thousand, two hundred twenty-one".