21550214553 has 24 divisors (see below), whose sum is σ = 33501061440. Its totient is φ = 12286320480.

The previous prime is 21550214533. The next prime is 21550214663. The reversal of 21550214553 is 35541205512.

It is not a de Polignac number, because 21550214553 - 2¹⁷ = 21550083481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21550214533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102438 + ... + 231503.

It is an arithmetic number, because the mean of its divisors is an integer number (1395877560).

Almost surely, 2^21550214553 is an apocalyptic number.

It is an amenable number.

21550214553 is a deficient number, since it is larger than the sum of its proper divisors (11950846887).

21550214553 is a wasteful number, since it uses less digits than its factorization.

21550214553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334397 (or 334390 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 33.

The spelling of 21550214553 in words is "twenty-one billion, five hundred fifty million, two hundred fourteen thousand, five hundred fifty-three".