21214036536253 has 4 divisors (see below), whose sum is σ = 23142585312288. Its totient is φ = 19285487760220.

The previous prime is 21214036536241. The next prime is 21214036536257. The reversal of 21214036536253 is 35263563041212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-21214036536253 is a prime.

It is a super-2 number, since 2×21214036536253² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036536257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964274388001 + ... + 964274388022.

It is an arithmetic number, because the mean of its divisors is an integer number (5785646328072).

Almost surely, 2^{21214036536253} is an apocalyptic number.

It is an amenable number.

21214036536253 is a deficient number, since it is larger than the sum of its proper divisors (1928548776035).

21214036536253 is a wasteful number, since it uses less digits than its factorization.

21214036536253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928548776034.

The product of its (nonzero) digits is 777600, while the sum is 43.

Adding to 21214036536253 its reverse (35263563041212), we get a palindrome (56477599577465).

The spelling of 21214036536253 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, two hundred fifty-three".