21654366213 has 8 divisors (see below), whose sum is σ = 28902980448. Its totient is φ = 14420998064.

The previous prime is 21654366203. The next prime is 21654366221. The reversal of 21654366213 is 31266345612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21654366213 - 2²¹ = 21652269061 is a prime.

It is a super-2 number, since 2×21654366213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21654366203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3808206 + ... + 3813887.

It is an arithmetic number, because the mean of its divisors is an integer number (3612872556).

Almost surely, 2^21654366213 is an apocalyptic number.

It is an amenable number.

21654366213 is a deficient number, since it is larger than the sum of its proper divisors (7248614235).

21654366213 is an equidigital number, since it uses as much as digits as its factorization.

21654366213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7623043.

The product of its digits is 155520, while the sum is 39.

The spelling of 21654366213 in words is "twenty-one billion, six hundred fifty-four million, three hundred sixty-six thousand, two hundred thirteen".