21146229815 has 8 divisors (see below), whose sum is σ = 25412632848. Its totient is φ = 16892212480.

The previous prime is 21146229809. The next prime is 21146229827. The reversal of 21146229815 is 51892264112.

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

It is not a de Polignac number, because 21146229815 - 2¹⁶ = 21146164279 is a prime.

It is a super-3 number, since 3×21146229815³ (a number of 32 digits) contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 3092666 + ... + 3099495.

It is an arithmetic number, because the mean of its divisors is an integer number (3176579106).

Almost surely, 2^21146229815 is an apocalyptic number.

21146229815 is a deficient number, since it is larger than the sum of its proper divisors (4266403033).

21146229815 is an equidigital number, since it uses as much as digits as its factorization.

21146229815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6192849.

The product of its digits is 69120, while the sum is 41.

The spelling of 21146229815 in words is "twenty-one billion, one hundred forty-six million, two hundred twenty-nine thousand, eight hundred fifteen".