21553261414 has 8 divisors (see below), whose sum is σ = 32333911200. Its totient is φ = 10775291016.

The previous prime is 21553261393. The next prime is 21553261417. The reversal of 21553261414 is 41416235512.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21553261414.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21553261417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649614 + ... + 681985.

It is an arithmetic number, because the mean of its divisors is an integer number (4041738900).

Almost surely, 2^21553261414 is an apocalyptic number.

21553261414 is a deficient number, since it is larger than the sum of its proper divisors (10780649786).

21553261414 is a wasteful number, since it uses less digits than its factorization.

21553261414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339694.

The product of its digits is 28800, while the sum is 34.

Adding to 21553261414 its reverse (41416235512), we get a palindrome (62969496926).

The spelling of 21553261414 in words is "twenty-one billion, five hundred fifty-three million, two hundred sixty-one thousand, four hundred fourteen".