21165670130 has 64 divisors (see below), whose sum is σ = 42225359616. Its totient is φ = 7574112000.

The previous prime is 21165670117. The next prime is 21165670133. The reversal of 21165670130 is 3107656112.

It is not an unprimeable number, because it can be changed into a prime (21165670133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4785320 + ... + 4789740.

It is an arithmetic number, because the mean of its divisors is an integer number (659771244).

Almost surely, 2^21165670130 is an apocalyptic number.

21165670130 is a deficient number, since it is larger than the sum of its proper divisors (21059689486).

21165670130 is a wasteful number, since it uses less digits than its factorization.

21165670130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5123.

The product of its (nonzero) digits is 7560, while the sum is 32.

The spelling of 21165670130 in words is "twenty-one billion, one hundred sixty-five million, six hundred seventy thousand, one hundred thirty".