21936294861 has 8 divisors (see below), whose sum is σ = 31498269600. Its totient is φ = 13499258352.

The previous prime is 21936294841. The next prime is 21936294871. The reversal of 21936294861 is 16849263912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21936294861 - 2²¹ = 21934197709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21936294841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281234511 + ... + 281234588.

It is an arithmetic number, because the mean of its divisors is an integer number (3937283700).

Almost surely, 2^21936294861 is an apocalyptic number.

It is an amenable number.

21936294861 is a deficient number, since it is larger than the sum of its proper divisors (9561974739).

21936294861 is a wasteful number, since it uses less digits than its factorization.

21936294861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562469115.

The product of its digits is 1119744, while the sum is 51.

The spelling of 21936294861 in words is "twenty-one billion, nine hundred thirty-six million, two hundred ninety-four thousand, eight hundred sixty-one".