21550550454 has 24 divisors (see below), whose sum is σ = 46825147512. Its totient is φ = 7163164800.

The previous prime is 21550550449. The next prime is 21550550459. The reversal of 21550550454 is 45405505512.

21550550454 is a `hidden beast` number, since 2 + 1 + 5 + 50 + 550 + 4 + 54 = 666.

It is an interprime number because it is at equal distance from previous prime (21550550449) and next prime (21550550459).

It is a super-2 number, since 2×21550550454² (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 (21550550459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1689472 + ... + 1702179.

It is an arithmetic number, because the mean of its divisors is an integer number (1951047813).

Almost surely, 2^21550550454 is an apocalyptic number.

21550550454 is an abundant number, since it is smaller than the sum of its proper divisors (25274597058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21550550454 is a wasteful number, since it uses less digits than its factorization.

21550550454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392012 (or 3392009 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 36.

The spelling of 21550550454 in words is "twenty-one billion, five hundred fifty million, five hundred fifty thousand, four hundred fifty-four".