21514401021 has 8 divisors (see below), whose sum is σ = 29114015584. Its totient is φ = 14128860240.

The previous prime is 21514400981. The next prime is 21514401023. The reversal of 21514401021 is 12010441512.

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

It is a de Polignac number, because none of the positive numbers 2^k-21514401021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514401023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53518210 + ... + 53518611.

It is an arithmetic number, because the mean of its divisors is an integer number (3639251948).

Almost surely, 2^21514401021 is an apocalyptic number.

It is an amenable number.

21514401021 is a deficient number, since it is larger than the sum of its proper divisors (7599614563).

21514401021 is a wasteful number, since it uses less digits than its factorization.

21514401021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107036891.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21514401021 its reverse (12010441512), we get a palindrome (33524842533).

The spelling of 21514401021 in words is "twenty-one billion, five hundred fourteen million, four hundred one thousand, twenty-one".