21266242155 has 48 divisors (see below), whose sum is σ = 38592197280. Its totient is φ = 10818898944.

The previous prime is 21266242117. The next prime is 21266242159. The reversal of 21266242155 is 55124266212.

21266242155 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 624 + 21 + 5 + 5 = 666.

It is not a de Polignac number, because 21266242155 - 2⁶ = 21266242091 is a prime.

It is a super-3 number, since 3×21266242155³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21266242159) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10147 + ... + 206483.

It is an arithmetic number, because the mean of its divisors is an integer number (804004110).

Almost surely, 2^21266242155 is an apocalyptic number.

21266242155 is a deficient number, since it is larger than the sum of its proper divisors (17325955125).

21266242155 is a wasteful number, since it uses less digits than its factorization.

21266242155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196460 (or 196457 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The spelling of 21266242155 in words is "twenty-one billion, two hundred sixty-six million, two hundred forty-two thousand, one hundred fifty-five".