21485024699 has 4 divisors (see below), whose sum is σ = 21849177720. Its totient is φ = 21120871680.

The previous prime is 21485024689. The next prime is 21485024723. The reversal of 21485024699 is 99642058412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21485024699 - 2¹² = 21485020603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21485024629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182076422 + ... + 182076539.

It is an arithmetic number, because the mean of its divisors is an integer number (5462294430).

Almost surely, 2^21485024699 is an apocalyptic number.

21485024699 is a deficient number, since it is larger than the sum of its proper divisors (364153021).

21485024699 is an equidigital number, since it uses as much as digits as its factorization.

21485024699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364153020.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 21485024699 in words is "twenty-one billion, four hundred eighty-five million, twenty-four thousand, six hundred ninety-nine".