21214036536451 has 16 divisors (see below), whose sum is σ = 23769095787360. Its totient is φ = 18763441102080.

The previous prime is 21214036536449. The next prime is 21214036536487. The reversal of 21214036536451 is 15463563041212.

It is a cyclic number.

It is not a de Polignac number, because 21214036536451 - 2¹ = 21214036536449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21214036536398 and 21214036536407.

It is not an unprimeable number, because it can be changed into a prime (21214036536401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8317695 + ... + 10564663.

It is an arithmetic number, because the mean of its divisors is an integer number (1485568486710).

Almost surely, 2^{21214036536451} is an apocalyptic number.

21214036536451 is a deficient number, since it is larger than the sum of its proper divisors (2555059250909).

21214036536451 is a wasteful number, since it uses less digits than its factorization.

21214036536451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270214.

The product of its (nonzero) digits is 518400, while the sum is 43.

Adding to 21214036536451 its reverse (15463563041212), we get a palindrome (36677599577663).

The spelling of 21214036536451 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, four hundred fifty-one".