21621411422515 has 8 divisors (see below), whose sum is σ = 25973383887360. Its totient is φ = 17278669017792.

The previous prime is 21621411422489. The next prime is 21621411422519. The reversal of 21621411422515 is 51522411412612.

It is a happy number.

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 21621411422515 - 2¹¹ = 21621411420467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21621411422519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2307509875 + ... + 2307519244.

It is an arithmetic number, because the mean of its divisors is an integer number (3246672985920).

Almost surely, 2^{21621411422515} is an apocalyptic number.

21621411422515 is a deficient number, since it is larger than the sum of its proper divisors (4351972464845).

21621411422515 is an equidigital number, since it uses as much as digits as its factorization.

21621411422515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615030061.

The product of its digits is 38400, while the sum is 37.

The spelling of 21621411422515 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred eleven million, four hundred twenty-two thousand, five hundred fifteen".