21115770273 has 24 divisors (see below), whose sum is σ = 32878198080. Its totient is φ = 12981880800.

The previous prime is 21115770259. The next prime is 21115770281. The reversal of 21115770273 is 37207751112.

It is a happy number.

21115770273 is a `hidden beast` number, since 2 + 1 + 11 + 577 + 0 + 2 + 73 = 666.

It is not a de Polignac number, because 21115770273 - 2⁹ = 21115769761 is a prime.

It is a super-2 number, since 2×21115770273² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21115770223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37108 + ... + 208826.

It is an arithmetic number, because the mean of its divisors is an integer number (1369924920).

Almost surely, 2^21115770273 is an apocalyptic number.

It is an amenable number.

21115770273 is a deficient number, since it is larger than the sum of its proper divisors (11762427807).

21115770273 is a wasteful number, since it uses less digits than its factorization.

21115770273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172789 (or 172786 counting only the distinct ones).

The product of its (nonzero) digits is 20580, while the sum is 36.

The spelling of 21115770273 in words is "twenty-one billion, one hundred fifteen million, seven hundred seventy thousand, two hundred seventy-three".