21024901799 has 12 divisors (see below), whose sum is σ = 23202121320. Its totient is φ = 19037370000.

The previous prime is 21024901787. The next prime is 21024901811. The reversal of 21024901799 is 99710942012.

It is an interprime number because it is at equal distance from previous prime (21024901787) and next prime (21024901811).

It is a de Polignac number, because none of the positive numbers 2^k-21024901799 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024901099) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 315764 + ... + 376505.

It is an arithmetic number, because the mean of its divisors is an integer number (1933510110).

Almost surely, 2^21024901799 is an apocalyptic number.

21024901799 is a deficient number, since it is larger than the sum of its proper divisors (2177219521).

21024901799 is a wasteful number, since it uses less digits than its factorization.

21024901799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692542 (or 692531 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 21024901799 in words is "twenty-one billion, twenty-four million, nine hundred one thousand, seven hundred ninety-nine".