21430234344 has 32 divisors (see below), whose sum is σ = 53614689120. Its totient is φ = 7138197696.

The previous prime is 21430234333. The next prime is 21430234369. The reversal of 21430234344 is 44343203412.

It is a happy number.

It is a super-2 number, since 2×21430234344² (a number of 21 digits) contains 22 as substring.

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, 292222 + ... + 358125.

It is an arithmetic number, because the mean of its divisors is an integer number (1675459035).

Almost surely, 2^21430234344 is an apocalyptic number.

21430234344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21430234344 is an abundant number, since it is smaller than the sum of its proper divisors (32184454776).

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

21430234344 is a wasteful number, since it uses less digits than its factorization.

21430234344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651729 (or 651725 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 21430234344 its reverse (44343203412), we get a palindrome (65773437756).

The spelling of 21430234344 in words is "twenty-one billion, four hundred thirty million, two hundred thirty-four thousand, three hundred forty-four".