21521411122433 has 8 divisors (see below), whose sum is σ = 21544039291200. Its totient is φ = 21498787621008.

The previous prime is 21521411122391. The next prime is 21521411122481. The reversal of 21521411122433 is 33422111412512.

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 21521411122433 - 2⁶ = 21521411122369 is a prime.

It is a super-2 number, since 2×21521411122433² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21521411122433.

It is not an unprimeable number, because it can be changed into a prime (21521411172433) 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, 8098778 + ... + 10422716.

It is an arithmetic number, because the mean of its divisors is an integer number (2693004911400).

Almost surely, 2^{21521411122433} is an apocalyptic number.

It is an amenable number.

21521411122433 is a deficient number, since it is larger than the sum of its proper divisors (22628168767).

21521411122433 is a wasteful number, since it uses less digits than its factorization.

21521411122433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333671.

The product of its digits is 11520, while the sum is 32.

Adding to 21521411122433 its reverse (33422111412512), we get a palindrome (54943522534945).

The spelling of 21521411122433 in words is "twenty-one trillion, five hundred twenty-one billion, four hundred eleven million, one hundred twenty-two thousand, four hundred thirty-three".