21244957995 has 8 divisors (see below), whose sum is σ = 33991932816. Its totient is φ = 11330644256.

The previous prime is 21244957973. The next prime is 21244958027. The reversal of 21244957995 is 59975944212.

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 21244957995 - 2⁶ = 21244957931 is a prime.

It is an unprimeable number.

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, 708165252 + ... + 708165281.

It is an arithmetic number, because the mean of its divisors is an integer number (4248991602).

Almost surely, 2^21244957995 is an apocalyptic number.

21244957995 is a deficient number, since it is larger than the sum of its proper divisors (12746974821).

21244957995 is a wasteful number, since it uses less digits than its factorization.

21244957995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416330541.

The product of its digits is 8164800, while the sum is 57.

The spelling of 21244957995 in words is "twenty-one billion, two hundred forty-four million, nine hundred fifty-seven thousand, nine hundred ninety-five".