15421000545 has 24 divisors (see below), whose sum is σ = 26801424936. Its totient is φ = 8202475008.

The previous prime is 15421000523. The next prime is 15421000549. The reversal of 15421000545 is 54500012451.

15421000545 is a `hidden beast` number, since 15 + 4 + 2 + 100 + 0 + 545 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3383399889 + 12037600656 = 58167^2 + 109716^2 .

It is not a de Polignac number, because 15421000545 - 2³⁰ = 14347258721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15421000549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 442584 + ... + 476153.

It is an arithmetic number, because the mean of its divisors is an integer number (1116726039).

Almost surely, 2^15421000545 is an apocalyptic number.

15421000545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15421000545 is a deficient number, since it is larger than the sum of its proper divisors (11380424391).

15421000545 is a wasteful number, since it uses less digits than its factorization.

15421000545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919121 (or 919118 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 15421000545 its reverse (54500012451), we get a palindrome (69921012996).

The spelling of 15421000545 in words is "fifteen billion, four hundred twenty-one million, five hundred forty-five", and thus it is an aban number.