131211223402 has 16 divisors (see below), whose sum is σ = 224963464320. Its totient is φ = 56225896848.

The previous prime is 131211223399. The next prime is 131211223411. The reversal of 131211223402 is 204322112131.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514113 + ... + 725764.

It is an arithmetic number, because the mean of its divisors is an integer number (14060216520).

Almost surely, 2^131211223402 is an apocalyptic number.

131211223402 is a deficient number, since it is larger than the sum of its proper divisors (93752240918).

131211223402 is a wasteful number, since it uses less digits than its factorization.

131211223402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247445.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 131211223402 its reverse (204322112131), we get a palindrome (335533335533).

The spelling of 131211223402 in words is "one hundred thirty-one billion, two hundred eleven million, two hundred twenty-three thousand, four hundred two".