21151122342 has 24 divisors (see below), whose sum is σ = 49208734296. Its totient is φ = 6043177728.

The previous prime is 21151122337. The next prime is 21151122361. The reversal of 21151122342 is 24322115112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35971003 + ... + 35971590.

It is an arithmetic number, because the mean of its divisors is an integer number (2050363929).

Almost surely, 2^21151122342 is an apocalyptic number.

21151122342 is an abundant number, since it is smaller than the sum of its proper divisors (28057611954).

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

21151122342 is a wasteful number, since it uses less digits than its factorization.

21151122342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71942612 (or 71942605 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

Adding to 21151122342 its reverse (24322115112), we get a palindrome (45473237454).

The spelling of 21151122342 in words is "twenty-one billion, one hundred fifty-one million, one hundred twenty-two thousand, three hundred forty-two".