21145450554 has 24 divisors (see below), whose sum is σ = 45818547840. Its totient is φ = 7047959688.

The previous prime is 21145450411. The next prime is 21145450559. The reversal of 21145450554 is 45505454112.

21145450554 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 54 + 50 + 554 = 666.

21145450554 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (21145450559) 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, 263799 + ... + 334485.

It is an arithmetic number, because the mean of its divisors is an integer number (1909106160).

Almost surely, 2^21145450554 is an apocalyptic number.

21145450554 is an abundant number, since it is smaller than the sum of its proper divisors (24673097286).

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

21145450554 is a wasteful number, since it uses less digits than its factorization.

21145450554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87314 (or 87311 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 36.

The spelling of 21145450554 in words is "twenty-one billion, one hundred forty-five million, four hundred fifty thousand, five hundred fifty-four".