21535012435451 has 8 divisors (see below), whose sum is σ = 22923135651600. Its totient is φ = 20172359370240.

The previous prime is 21535012435439. The next prime is 21535012435483. The reversal of 21535012435451 is 15453421053512.

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 21535012435451 - 2²² = 21535008241147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21535012435399 and 21535012435408.

It is not an unprimeable number, because it can be changed into a prime (21535012435411) 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, 6367535990 + ... + 6367539371.

It is an arithmetic number, because the mean of its divisors is an integer number (2865391956450).

Almost surely, 2^{21535012435451} is an apocalyptic number.

21535012435451 is a deficient number, since it is larger than the sum of its proper divisors (1388123216149).

21535012435451 is a wasteful number, since it uses less digits than its factorization.

21535012435451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12735075469.

The product of its (nonzero) digits is 360000, while the sum is 41.

Adding to 21535012435451 its reverse (15453421053512), we get a palindrome (36988433488963).

The spelling of 21535012435451 in words is "twenty-one trillion, five hundred thirty-five billion, twelve million, four hundred thirty-five thousand, four hundred fifty-one".