21249298426 has 8 divisors (see below), whose sum is σ = 31968530100. Its totient is φ = 10593121728.

The previous prime is 21249298391. The next prime is 21249298517. The reversal of 21249298426 is 62489294212.

It can be written as a sum of positive squares in 2 ways, for example, as 20909449201 + 339849225 = 144601^2 + 18435^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21249298426.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15762901 + ... + 15764248.

Almost surely, 2^21249298426 is an apocalyptic number.

21249298426 is a deficient number, since it is larger than the sum of its proper divisors (10719231674).

21249298426 is a wasteful number, since it uses less digits than its factorization.

21249298426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31527488.

The product of its digits is 995328, while the sum is 49.

The spelling of 21249298426 in words is "twenty-one billion, two hundred forty-nine million, two hundred ninety-eight thousand, four hundred twenty-six".