21241188761 has 16 divisors (see below), whose sum is σ = 23028183360. Its totient is φ = 19476304320.

The previous prime is 21241188743. The next prime is 21241188769. The reversal of 21241188761 is 16788114212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21241188761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21241188769) 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, 2352746 + ... + 2361756.

It is an arithmetic number, because the mean of its divisors is an integer number (1439261460).

Almost surely, 2^21241188761 is an apocalyptic number.

It is an amenable number.

21241188761 is a deficient number, since it is larger than the sum of its proper divisors (1786994599).

21241188761 is a wasteful number, since it uses less digits than its factorization.

21241188761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10216.

The product of its digits is 43008, while the sum is 41.

The spelling of 21241188761 in words is "twenty-one billion, two hundred forty-one million, one hundred eighty-eight thousand, seven hundred sixty-one".