21214036533551 has 8 divisors (see below), whose sum is σ = 21235677969744. Its totient is φ = 21192400942720.

The previous prime is 21214036533497. The next prime is 21214036533581. The reversal of 21214036533551 is 15533563041212.

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 21214036533551 - 2³⁴ = 21196856664367 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21214036533499 and 21214036533508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036533581) 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, 5819261 + ... + 8734521.

It is an arithmetic number, because the mean of its divisors is an integer number (2654459746218).

Almost surely, 2^{21214036533551} is an apocalyptic number.

21214036533551 is a deficient number, since it is larger than the sum of its proper divisors (21641436193).

21214036533551 is a wasteful number, since it uses less digits than its factorization.

21214036533551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922681.

The product of its (nonzero) digits is 324000, while the sum is 41.

Adding to 21214036533551 its reverse (15533563041212), we get a palindrome (36747599574763).

The spelling of 21214036533551 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-three thousand, five hundred fifty-one".