21311020342 has 8 divisors (see below), whose sum is σ = 31997007000. Its totient is φ = 10645351344.

The previous prime is 21311020309. The next prime is 21311020343. The reversal of 21311020342 is 24302011312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311020343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5076792 + ... + 5080987.

It is an arithmetic number, because the mean of its divisors is an integer number (3999625875).

Almost surely, 2^21311020342 is an apocalyptic number.

21311020342 is a deficient number, since it is larger than the sum of its proper divisors (10685986658).

21311020342 is a wasteful number, since it uses less digits than its factorization.

21311020342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10158830.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21311020342 its reverse (24302011312), we get a palindrome (45613031654).

The spelling of 21311020342 in words is "twenty-one billion, three hundred eleven million, twenty thousand, three hundred forty-two".