21140473767 has 16 divisors (see below), whose sum is σ = 32227902720. Its totient is φ = 12075077952.

The previous prime is 21140473741. The next prime is 21140473769. The reversal of 21140473767 is 76737404112.

It is a happy number.

It is not a de Polignac number, because 21140473767 - 2⁶ = 21140473703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140473769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166078 + ... + 264315.

It is an arithmetic number, because the mean of its divisors is an integer number (2014243920).

Almost surely, 2^21140473767 is an apocalyptic number.

21140473767 is a deficient number, since it is larger than the sum of its proper divisors (11087428953).

21140473767 is a wasteful number, since it uses less digits than its factorization.

21140473767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432742.

The product of its (nonzero) digits is 197568, while the sum is 42.

Adding to 21140473767 its reverse (76737404112), we get a palindrome (97877877879).

The spelling of 21140473767 in words is "twenty-one billion, one hundred forty million, four hundred seventy-three thousand, seven hundred sixty-seven".