21214580054661 has 24 divisors (see below), whose sum is σ = 35875062210624. Its totient is φ = 11826943583040.

The previous prime is 21214580054621. The next prime is 21214580054779. The reversal of 21214580054661 is 16645008541212.

21214580054661 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 4 + 580 + 0 + 5 + 4 + 6 + 61 = 666.

It is not a de Polignac number, because 21214580054661 - 2¹⁹ = 21214579530373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214580054621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4106575051 + ... + 4106580216.

It is an arithmetic number, because the mean of its divisors is an integer number (1494794258776).

Almost surely, 2^{21214580054661} is an apocalyptic number.

21214580054661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21214580054661 is a deficient number, since it is larger than the sum of its proper divisors (14660482155963).

21214580054661 is a wasteful number, since it uses less digits than its factorization.

21214580054661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8213155321 (or 8213155318 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

Adding to 21214580054661 its reverse (16645008541212), we get a palindrome (37859588595873).

The spelling of 21214580054661 in words is "twenty-one trillion, two hundred fourteen billion, five hundred eighty million, fifty-four thousand, six hundred sixty-one".