21268949353 has 32 divisors (see below), whose sum is σ = 23682816000. Its totient is φ = 19025772480.

The previous prime is 21268949329. The next prime is 21268949369. The reversal of 21268949353 is 35394986212.

It is not a de Polignac number, because 21268949353 - 2²⁹ = 20732078441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21268949353.

It is not an unprimeable number, because it can be changed into a prime (21268949323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3273438 + ... + 3279928.

It is an arithmetic number, because the mean of its divisors is an integer number (740088000).

Almost surely, 2^21268949353 is an apocalyptic number.

It is an amenable number.

21268949353 is a deficient number, since it is larger than the sum of its proper divisors (2413866647).

21268949353 is a wasteful number, since it uses less digits than its factorization.

21268949353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6685.

The product of its digits is 2799360, while the sum is 52.

The spelling of 21268949353 in words is "twenty-one billion, two hundred sixty-eight million, nine hundred forty-nine thousand, three hundred fifty-three".