20154540221 has 8 divisors (see below), whose sum is σ = 20241460224. Its totient is φ = 20067722640.

The previous prime is 20154540199. The next prime is 20154540253. The reversal of 20154540221 is 12204545102.

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 20154540221 - 2¹⁸ = 20154278077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20154540521) 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, 382736 + ... + 432198.

It is an arithmetic number, because the mean of its divisors is an integer number (2530182528).

Almost surely, 2^20154540221 is an apocalyptic number.

It is an amenable number.

20154540221 is a deficient number, since it is larger than the sum of its proper divisors (86920003).

20154540221 is a wasteful number, since it uses less digits than its factorization.

20154540221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51211.

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 20154540221 in words is "twenty billion, one hundred fifty-four million, five hundred forty thousand, two hundred twenty-one".