21130023442 has 64 divisors (see below), whose sum is σ = 36714332160. Its totient is φ = 9029563200.

The previous prime is 21130023419. The next prime is 21130023487. The reversal of 21130023442 is 24432003112.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 10506217 + ... + 10508227.

It is an arithmetic number, because the mean of its divisors is an integer number (573661440).

Almost surely, 2^21130023442 is an apocalyptic number.

21130023442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21130023442 is a deficient number, since it is larger than the sum of its proper divisors (15584308718).

21130023442 is a wasteful number, since it uses less digits than its factorization.

21130023442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21130023442 its reverse (24432003112), we get a palindrome (45562026554).

The spelling of 21130023442 in words is "twenty-one billion, one hundred thirty million, twenty-three thousand, four hundred forty-two".