21028904426702 has 4 divisors (see below), whose sum is σ = 31543356640056. Its totient is φ = 10514452213350.

The previous prime is 21028904426627. The next prime is 21028904426743. The reversal of 21028904426702 is 20762440982012.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5257226106674 + ... + 5257226106677.

It is an arithmetic number, because the mean of its divisors is an integer number (7885839160014).

Almost surely, 2^{21028904426702} is an apocalyptic number.

21028904426702 is a deficient number, since it is larger than the sum of its proper divisors (10514452213354).

21028904426702 is a wasteful number, since it uses less digits than its factorization.

21028904426702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10514452213353.

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 21028904426702 in words is "twenty-one trillion, twenty-eight billion, nine hundred four million, four hundred twenty-six thousand, seven hundred two".