21268949354 has 4 divisors (see below), whose sum is σ = 31903424034. Its totient is φ = 10634474676.

The previous prime is 21268949329. The next prime is 21268949369. The reversal of 21268949354 is 45394986212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16854011329 + 4414938025 = 129823^2 + 66445^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21268949296 and 21268949305.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5317237337 + ... + 5317237340.

Almost surely, 2^21268949354 is an apocalyptic number.

21268949354 is a deficient number, since it is larger than the sum of its proper divisors (10634474680).

21268949354 is a wasteful number, since it uses less digits than its factorization.

21268949354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10634474679.

The product of its digits is 3732480, while the sum is 53.

The spelling of 21268949354 in words is "twenty-one billion, two hundred sixty-eight million, nine hundred forty-nine thousand, three hundred fifty-four".