21230151125615 has 4 divisors (see below), whose sum is σ = 25476181350744. Its totient is φ = 16984120900488.

The previous prime is 21230151125593. The next prime is 21230151125647. The reversal of 21230151125615 is 51652115103212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21230151125615 - 2³⁴ = 21212971256431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123015112557 + ... + 2123015112566.

It is an arithmetic number, because the mean of its divisors is an integer number (6369045337686).

Almost surely, 2^{21230151125615} is an apocalyptic number.

21230151125615 is a deficient number, since it is larger than the sum of its proper divisors (4246030225129).

21230151125615 is an equidigital number, since it uses as much as digits as its factorization.

21230151125615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246030225128.

The product of its (nonzero) digits is 18000, while the sum is 35.

Adding to 21230151125615 its reverse (51652115103212), we get a palindrome (72882266228827).

The spelling of 21230151125615 in words is "twenty-one trillion, two hundred thirty billion, one hundred fifty-one million, one hundred twenty-five thousand, six hundred fifteen".