21660363154227 has 64 divisors (see below), whose sum is σ = 35436786868224. Its totient is φ = 11499558216960.

The previous prime is 21660363154153. The next prime is 21660363154229. The reversal of 21660363154227 is 72245136306612.

It is a happy number.

It is not a de Polignac number, because 21660363154227 - 2¹⁴ = 21660363137843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21660363154229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2086048 + ... + 6904514.

It is an arithmetic number, because the mean of its divisors is an integer number (553699794816).

Almost surely, 2^{21660363154227} is an apocalyptic number.

21660363154227 is a deficient number, since it is larger than the sum of its proper divisors (13776423713997).

21660363154227 is a wasteful number, since it uses less digits than its factorization.

21660363154227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4818768.

The product of its (nonzero) digits is 2177280, while the sum is 48.

The spelling of 21660363154227 in words is "twenty-one trillion, six hundred sixty billion, three hundred sixty-three million, one hundred fifty-four thousand, two hundred twenty-seven".