21241187639 has 16 divisors (see below), whose sum is σ = 24349409280. Its totient is φ = 18151499520.

The previous prime is 21241187623. The next prime is 21241187641. The reversal of 21241187639 is 93678114212.

It is not a de Polignac number, because 21241187639 - 2⁴ = 21241187623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21241187639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241187699) 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, 3384074 + ... + 3390344.

It is an arithmetic number, because the mean of its divisors is an integer number (1521838080).

Almost surely, 2^21241187639 is an apocalyptic number.

21241187639 is a deficient number, since it is larger than the sum of its proper divisors (3108221641).

21241187639 is an equidigital number, since it uses as much as digits as its factorization.

21241187639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7670.

The product of its digits is 145152, while the sum is 44.

The spelling of 21241187639 in words is "twenty-one billion, two hundred forty-one million, one hundred eighty-seven thousand, six hundred thirty-nine".