21152520114421 has 8 divisors (see below), whose sum is σ = 21161852769600. Its totient is φ = 21143187927840.

The previous prime is 21152520114419. The next prime is 21152520114503. The reversal of 21152520114421 is 12441102525112.

It is a happy number.

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 21152520114421 - 2¹ = 21152520114419 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 (21152520114521) 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, 114693160 + ... + 114877438.

It is an arithmetic number, because the mean of its divisors is an integer number (2645231596200).

Almost surely, 2^{21152520114421} is an apocalyptic number.

It is an amenable number.

21152520114421 is a deficient number, since it is larger than the sum of its proper divisors (9332655179).

21152520114421 is a wasteful number, since it uses less digits than its factorization.

21152520114421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234299.

The product of its (nonzero) digits is 6400, while the sum is 31.

Adding to 21152520114421 its reverse (12441102525112), we get a palindrome (33593622639533).

The spelling of 21152520114421 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred twenty million, one hundred fourteen thousand, four hundred twenty-one".