31301213213121 has 16 divisors (see below), whose sum is σ = 42358501300224. Its totient is φ = 20555709722064.

The previous prime is 31301213213119. The next prime is 31301213213143. The reversal of 31301213213121 is 12131231210313.

It is not a de Polignac number, because 31301213213121 - 2¹ = 31301213213119 is a prime.

It is a super-2 number, since 2×31301213213121² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31301213213091 and 31301213213100.

It is not an unprimeable number, because it can be changed into a prime (31301213213821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12541896 + ... + 14829078.

It is an arithmetic number, because the mean of its divisors is an integer number (2647406331264).

Almost surely, 2^{31301213213121} is an apocalyptic number.

It is an amenable number.

31301213213121 is a deficient number, since it is larger than the sum of its proper divisors (11057288087103).

31301213213121 is a wasteful number, since it uses less digits than its factorization.

31301213213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355340.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 31301213213121 its reverse (12131231210313), we get a palindrome (43432444423434).

The spelling of 31301213213121 in words is "thirty-one trillion, three hundred one billion, two hundred thirteen million, two hundred thirteen thousand, one hundred twenty-one".