21515410554453 has 12 divisors (see below), whose sum is σ = 31103351674668. Its totient is φ = 14331820992000.

The previous prime is 21515410554371. The next prime is 21515410554457. The reversal of 21515410554453 is 35445501451512.

21515410554453 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 5 + 41 + 0 + 554 + 4 + 53 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4390189897284 + 17125220657169 = 2095278^2 + 4138263^2 .

It is not a de Polignac number, because 21515410554453 - 2⁹ = 21515410553941 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21515410554399 and 21515410554408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515410554457) 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, 982158798 + ... + 982180703.

It is an arithmetic number, because the mean of its divisors is an integer number (2591945972889).

Almost surely, 2^{21515410554453} is an apocalyptic number.

It is an amenable number.

21515410554453 is a deficient number, since it is larger than the sum of its proper divisors (9587941120215).

21515410554453 is a wasteful number, since it uses less digits than its factorization.

21515410554453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1964340724 (or 1964340721 counting only the distinct ones).

The product of its (nonzero) digits is 1200000, while the sum is 45.

The spelling of 21515410554453 in words is "twenty-one trillion, five hundred fifteen billion, four hundred ten million, five hundred fifty-four thousand, four hundred fifty-three".