21214036013215 has 4 divisors (see below), whose sum is σ = 25456843215864. Its totient is φ = 16971228810568.

The previous prime is 21214036013179. The next prime is 21214036013231. The reversal of 21214036013215 is 51231063041212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21214036013215 - 2²⁷ = 21213901795487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2121403601317 + ... + 2121403601326.

It is an arithmetic number, because the mean of its divisors is an integer number (6364210803966).

Almost surely, 2^{21214036013215} is an apocalyptic number.

21214036013215 is a deficient number, since it is larger than the sum of its proper divisors (4242807202649).

21214036013215 is an equidigital number, since it uses as much as digits as its factorization.

21214036013215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242807202648.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 21214036013215 its reverse (51231063041212), we get a palindrome (72445099054427).

The spelling of 21214036013215 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, thirteen thousand, two hundred fifteen".