31012102102 has 4 divisors (see below), whose sum is σ = 46518153156. Its totient is φ = 15506051050.

The previous prime is 31012102097. The next prime is 31012102123. The reversal of 31012102102 is 20120121013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20120121013 = 43 ⋅467909791.

It is a super-4 number, since 4×31012102102⁴ (a number of 43 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7753025524 + ... + 7753025527.

It is an arithmetic number, because the mean of its divisors is an integer number (11629538289).

Almost surely, 2^31012102102 is an apocalyptic number.

31012102102 is a deficient number, since it is larger than the sum of its proper divisors (15506051054).

31012102102 is a wasteful number, since it uses less digits than its factorization.

31012102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15506051053.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 31012102102 its reverse (20120121013), we get a palindrome (51132223115).

The spelling of 31012102102 in words is "thirty-one billion, twelve million, one hundred two thousand, one hundred two".