21214036536455 has 16 divisors (see below), whose sum is σ = 29093633395200. Its totient is φ = 14546719123872.

The previous prime is 21214036536449. The next prime is 21214036536487. The reversal of 21214036536455 is 55463563041212.

It is a cyclic number.

It is not a de Polignac number, because 21214036536455 - 2¹⁶ = 21214036470919 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11869646 + ... + 13539444.

It is an arithmetic number, because the mean of its divisors is an integer number (1818352087200).

Almost surely, 2^{21214036536455} is an apocalyptic number.

21214036536455 is a deficient number, since it is larger than the sum of its proper divisors (7879596858745).

21214036536455 is a wasteful number, since it uses less digits than its factorization.

21214036536455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032798.

The product of its (nonzero) digits is 2592000, while the sum is 47.

Adding to 21214036536455 its reverse (55463563041212), we get a palindrome (76677599577667).

The spelling of 21214036536455 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, four hundred fifty-five".