21411637537 has 8 divisors (see below), whose sum is σ = 21914165504. Its totient is φ = 20909317968.

The previous prime is 21411637477. The next prime is 21411637561. The reversal of 21411637537 is 73573611412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21411637537 - 2⁷ = 21411637409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21411637537.

It is not an unprimeable number, because it can be changed into a prime (21411632537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166423 + ... + 265555.

It is an arithmetic number, because the mean of its divisors is an integer number (2739270688).

Almost surely, 2^21411637537 is an apocalyptic number.

It is an amenable number.

21411637537 is a deficient number, since it is larger than the sum of its proper divisors (502527967).

21411637537 is an equidigital number, since it uses as much as digits as its factorization.

21411637537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104199.

The product of its digits is 105840, while the sum is 40.

The spelling of 21411637537 in words is "twenty-one billion, four hundred eleven million, six hundred thirty-seven thousand, five hundred thirty-seven".