21552145311 has 4 divisors (see below), whose sum is σ = 28736193752. Its totient is φ = 14368096872.

The previous prime is 21552145309. The next prime is 21552145313. The reversal of 21552145311 is 11354125512.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21552145309) and next prime (21552145313).

It is not a de Polignac number, because 21552145311 - 2¹ = 21552145309 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 (21552145313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3592024216 + ... + 3592024221.

It is an arithmetic number, because the mean of its divisors is an integer number (7184048438).

Almost surely, 2^21552145311 is an apocalyptic number.

21552145311 is a deficient number, since it is larger than the sum of its proper divisors (7184048441).

21552145311 is an equidigital number, since it uses as much as digits as its factorization.

21552145311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7184048440.

The product of its digits is 6000, while the sum is 30.

The spelling of 21552145311 in words is "twenty-one billion, five hundred fifty-two million, one hundred forty-five thousand, three hundred eleven".