21545541323315 has 8 divisors (see below), whose sum is σ = 25854683811840. Its totient is φ = 17236410242752.

The previous prime is 21545541323279. The next prime is 21545541323321. The reversal of 21545541323315 is 51332314554512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21545541323315 - 2²⁴ = 21545524546099 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2077646 + ... + 6885324.

It is an arithmetic number, because the mean of its divisors is an integer number (3231835476480).

Almost surely, 2^{21545541323315} is an apocalyptic number.

21545541323315 is a deficient number, since it is larger than the sum of its proper divisors (4309142488525).

21545541323315 is an equidigital number, since it uses as much as digits as its factorization.

21545541323315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5703981.

The product of its digits is 1080000, while the sum is 44.

Adding to 21545541323315 its reverse (51332314554512), we get a palindrome (72877855877827).

The spelling of 21545541323315 in words is "twenty-one trillion, five hundred forty-five billion, five hundred forty-one million, three hundred twenty-three thousand, three hundred fifteen".