21204130344 has 32 divisors (see below), whose sum is σ = 53013985920. Its totient is φ = 7067555456.

The previous prime is 21204130291. The next prime is 21204130369. The reversal of 21204130344 is 44303140212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549244 + ... + 586580.

It is an arithmetic number, because the mean of its divisors is an integer number (1656687060).

Almost surely, 2^21204130344 is an apocalyptic number.

21204130344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21204130344 is an abundant number, since it is smaller than the sum of its proper divisors (31809855576).

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

21204130344 is a wasteful number, since it uses less digits than its factorization.

21204130344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61009 (or 61005 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21204130344 its reverse (44303140212), we get a palindrome (65507270556).

The spelling of 21204130344 in words is "twenty-one billion, two hundred four million, one hundred thirty thousand, three hundred forty-four".