21861467797 has 16 divisors (see below), whose sum is σ = 24210562432. Its totient is φ = 19609128000.

The previous prime is 21861467699. The next prime is 21861467807. The reversal of 21861467797 is 79776416812.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21861467797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21861467297) 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, 349672 + ... + 407422.

It is an arithmetic number, because the mean of its divisors is an integer number (1513160152).

Almost surely, 2^21861467797 is an apocalyptic number.

It is an amenable number.

21861467797 is a deficient number, since it is larger than the sum of its proper divisors (2349094635).

21861467797 is a wasteful number, since it uses less digits than its factorization.

21861467797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58588.

The product of its digits is 7112448, while the sum is 58.

The spelling of 21861467797 in words is "twenty-one billion, eight hundred sixty-one million, four hundred sixty-seven thousand, seven hundred ninety-seven".