21311331342 has 64 divisors (see below), whose sum is σ = 54291617280. Its totient is φ = 5429154816.

The previous prime is 21311331337. The next prime is 21311331443. The reversal of 21311331342 is 24313311312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 771903 + ... + 799034.

It is an arithmetic number, because the mean of its divisors is an integer number (848306520).

Almost surely, 2^21311331342 is an apocalyptic number.

21311331342 is an abundant number, since it is smaller than the sum of its proper divisors (32980285938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311331342 is a wasteful number, since it uses less digits than its factorization.

21311331342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570985.

The product of its digits is 1296, while the sum is 24.

Adding to 21311331342 its reverse (24313311312), we get a palindrome (45624642654).

The spelling of 21311331342 in words is "twenty-one billion, three hundred eleven million, three hundred thirty-one thousand, three hundred forty-two".