31401302121 has 24 divisors (see below), whose sum is σ = 52059571200. Its totient is φ = 17866581696.

The previous prime is 31401302113. The next prime is 31401302129. The reversal of 31401302121 is 12120310413.

It is an interprime number because it is at equal distance from previous prime (31401302113) and next prime (31401302129).

It is not a de Polignac number, because 31401302121 - 2³ = 31401302113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31401302094 and 31401302103.

It is not an unprimeable number, because it can be changed into a prime (31401302129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1054921 + ... + 1084278.

It is an arithmetic number, because the mean of its divisors is an integer number (2169148800).

Almost surely, 2^31401302121 is an apocalyptic number.

It is an amenable number.

31401302121 is a deficient number, since it is larger than the sum of its proper divisors (20658269079).

31401302121 is a wasteful number, since it uses less digits than its factorization.

31401302121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139445 (or 2139442 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31401302121 its reverse (12120310413), we get a palindrome (43521612534).

The spelling of 31401302121 in words is "thirty-one billion, four hundred one million, three hundred two thousand, one hundred twenty-one".