21114502581 has 8 divisors (see below), whose sum is σ = 28431409824. Its totient is φ = 13936965200.

The previous prime is 21114502567. The next prime is 21114502589. The reversal of 21114502581 is 18520541112.

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 21114502581 - 2⁹ = 21114502069 is a prime.

It is a super-2 number, since 2×21114502581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114502589) 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, 34842111 + ... + 34842716.

It is an arithmetic number, because the mean of its divisors is an integer number (3553926228).

Almost surely, 2^21114502581 is an apocalyptic number.

It is an amenable number.

21114502581 is a deficient number, since it is larger than the sum of its proper divisors (7316907243).

21114502581 is a wasteful number, since it uses less digits than its factorization.

21114502581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69684931.

The product of its (nonzero) digits is 3200, while the sum is 30.

The spelling of 21114502581 in words is "twenty-one billion, one hundred fourteen million, five hundred two thousand, five hundred eighty-one".