21554552211 has 8 divisors (see below), whose sum is σ = 28789213584. Its totient is φ = 14344796160.

The previous prime is 21554552197. The next prime is 21554552231. The reversal of 21554552211 is 11225545512.

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

It is not a de Polignac number, because 21554552211 - 2⁹ = 21554551699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21554552231) 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, 6224310 + ... + 6227771.

It is an arithmetic number, because the mean of its divisors is an integer number (3598651698).

Almost surely, 2^21554552211 is an apocalyptic number.

21554552211 is a deficient number, since it is larger than the sum of its proper divisors (7234661373).

21554552211 is a wasteful number, since it uses less digits than its factorization.

21554552211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12452661.

The product of its digits is 20000, while the sum is 33.

The spelling of 21554552211 in words is "twenty-one billion, five hundred fifty-four million, five hundred fifty-two thousand, two hundred eleven".