21028244998 has 4 divisors (see below), whose sum is σ = 31542367500. Its totient is φ = 10514122498.

The previous prime is 21028244987. The next prime is 21028245037. The reversal of 21028244998 is 89944282012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5257061248 + ... + 5257061251.

It is an arithmetic number, because the mean of its divisors is an integer number (7885591875).

Almost surely, 2^21028244998 is an apocalyptic number.

21028244998 is a deficient number, since it is larger than the sum of its proper divisors (10514122502).

21028244998 is a wasteful number, since it uses less digits than its factorization.

21028244998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10514122501.

The product of its (nonzero) digits is 663552, while the sum is 49.

The spelling of 21028244998 in words is "twenty-one billion, twenty-eight million, two hundred forty-four thousand, nine hundred ninety-eight".