21130002345 has 16 divisors (see below), whose sum is σ = 33811710912. Its totient is φ = 11268098880.

The previous prime is 21130002331. The next prime is 21130002367. The reversal of 21130002345 is 54320003112.

It is not a de Polignac number, because 21130002345 - 2⁶ = 21130002281 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73630 + ... + 218360.

It is an arithmetic number, because the mean of its divisors is an integer number (2113231932).

Almost surely, 2^21130002345 is an apocalyptic number.

It is an amenable number.

21130002345 is a deficient number, since it is larger than the sum of its proper divisors (12681708567).

21130002345 is a wasteful number, since it uses less digits than its factorization.

21130002345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154472.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21130002345 its reverse (54320003112), we get a palindrome (75450005457).

The spelling of 21130002345 in words is "twenty-one billion, one hundred thirty million, two thousand, three hundred forty-five".