21054445015 has 16 divisors (see below), whose sum is σ = 26959413600. Its totient is φ = 15738458112.

The previous prime is 21054445003. The next prime is 21054445033. The reversal of 21054445015 is 51054445012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21054445015 - 2⁹ = 21054444503 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1511050 + ... + 1524919.

It is an arithmetic number, because the mean of its divisors is an integer number (1684963350).

Almost surely, 2^21054445015 is an apocalyptic number.

21054445015 is a deficient number, since it is larger than the sum of its proper divisors (5904968585).

21054445015 is a wasteful number, since it uses less digits than its factorization.

21054445015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036066.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 21054445015 in words is "twenty-one billion, fifty-four million, four hundred forty-five thousand, fifteen".