21630706540115 has 32 divisors (see below), whose sum is σ = 26266051491840. Its totient is φ = 17099872239744.

The previous prime is 21630706540111. The next prime is 21630706540117. The reversal of 21630706540115 is 51104560703612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21630706540115 - 2² = 21630706540111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21630706540111) 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, 125940077 + ... + 126111713.

It is an arithmetic number, because the mean of its divisors is an integer number (820814109120).

Almost surely, 2^{21630706540115} is an apocalyptic number.

21630706540115 is a deficient number, since it is larger than the sum of its proper divisors (4635344951725).

21630706540115 is a wasteful number, since it uses less digits than its factorization.

21630706540115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172691.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 21630706540115 in words is "twenty-one trillion, six hundred thirty billion, seven hundred six million, five hundred forty thousand, one hundred fifteen".