21154535612366 has 32 divisors (see below), whose sum is σ = 35878708887840. Its totient is φ = 9286254020736.

The previous prime is 21154535612333. The next prime is 21154535612411. The reversal of 21154535612366 is 66321653545112.

It is a super-2 number, since 2×21154535612366² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 209325701 + ... + 209426736.

It is an arithmetic number, because the mean of its divisors is an integer number (1121209652745).

Almost surely, 2^{21154535612366} is an apocalyptic number.

21154535612366 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21154535612366 is a deficient number, since it is larger than the sum of its proper divisors (14724173275474).

21154535612366 is a wasteful number, since it uses less digits than its factorization.

21154535612366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418752548.

The product of its digits is 3888000, while the sum is 50.

The spelling of 21154535612366 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-five million, six hundred twelve thousand, three hundred sixty-six".