31102121002 has 4 divisors (see below), whose sum is σ = 46653181506. Its totient is φ = 15551060500.

The previous prime is 31102120969. The next prime is 31102121047. The reversal of 31102121002 is 20012120113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20012120113 = 307 ⋅65186059.

It can be written as a sum of positive squares in only one way, i.e., 21712317201 + 9389803801 = 147351^2 + 96901^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7775530249 + ... + 7775530252.

Almost surely, 2^31102121002 is an apocalyptic number.

31102121002 is a deficient number, since it is larger than the sum of its proper divisors (15551060504).

31102121002 is a wasteful number, since it uses less digits than its factorization.

31102121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15551060503.

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

Adding to 31102121002 its reverse (20012120113), we get a palindrome (51114241115).

The spelling of 31102121002 in words is "thirty-one billion, one hundred two million, one hundred twenty-one thousand, two".