21130042344 has 16 divisors (see below), whose sum is σ = 52825105920. Its totient is φ = 7043347440.

The previous prime is 21130042333. The next prime is 21130042393. The reversal of 21130042344 is 44324003112.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 880418431 = 21130042344 / (2 + 1 + 1 + 3 + 0 + 0 + 4 + 2 + 3 + 4 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440209192 + ... + 440209239.

It is an arithmetic number, because the mean of its divisors is an integer number (3301569120).

Almost surely, 2^21130042344 is an apocalyptic number.

21130042344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21130042344 is an abundant number, since it is smaller than the sum of its proper divisors (31695063576).

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

21130042344 is a wasteful number, since it uses less digits than its factorization.

21130042344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880418440 (or 880418436 counting only the distinct ones).

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

Adding to 21130042344 its reverse (44324003112), we get a palindrome (65454045456).

The spelling of 21130042344 in words is "twenty-one billion, one hundred thirty million, forty-two thousand, three hundred forty-four".