21126443226515 has 32 divisors (see below), whose sum is σ = 27722171042496. Its totient is φ = 15328170639360.

The previous prime is 21126443226503. The next prime is 21126443226541. The reversal of 21126443226515 is 51562234462112.

It is not a de Polignac number, because 21126443226515 - 2⁶ = 21126443226451 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 669114269 + ... + 669145841.

It is an arithmetic number, because the mean of its divisors is an integer number (866317845078).

Almost surely, 2^{21126443226515} is an apocalyptic number.

21126443226515 is a deficient number, since it is larger than the sum of its proper divisors (6595727815981).

21126443226515 is a wasteful number, since it uses less digits than its factorization.

21126443226515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60119.

The product of its digits is 691200, while the sum is 44.

Adding to 21126443226515 its reverse (51562234462112), we get a palindrome (72688677688627).

The spelling of 21126443226515 in words is "twenty-one trillion, one hundred twenty-six billion, four hundred forty-three million, two hundred twenty-six thousand, five hundred fifteen".