21211311342 has 48 divisors (see below), whose sum is σ = 45957492720. Its totient is φ = 6523635456.

The previous prime is 21211311227. The next prime is 21211311391. The reversal of 21211311342 is 24311311212.

It is a congruent number.

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 in 23 ways as a sum of consecutive naturals, for example, 3725634 + ... + 3731322.

It is an arithmetic number, because the mean of its divisors is an integer number (957447765).

Almost surely, 2^21211311342 is an apocalyptic number.

21211311342 is an abundant number, since it is smaller than the sum of its proper divisors (24746181378).

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

21211311342 is a wasteful number, since it uses less digits than its factorization.

21211311342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9397 (or 9384 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

Adding to 21211311342 its reverse (24311311212), we get a palindrome (45522622554).

The spelling of 21211311342 in words is "twenty-one billion, two hundred eleven million, three hundred eleven thousand, three hundred forty-two".