21028883434 has 16 divisors (see below), whose sum is σ = 34526618280. Its totient is φ = 9546528960.

The previous prime is 21028883429. The next prime is 21028883453. The reversal of 21028883434 is 43438882012.

It can be written as a sum of positive squares in 4 ways, for example, as 15471628225 + 5557255209 = 124385^2 + 74547^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6627949 + ... + 6631120.

Almost surely, 2^21028883434 is an apocalyptic number.

21028883434 is a deficient number, since it is larger than the sum of its proper divisors (13497734846).

21028883434 is a wasteful number, since it uses less digits than its factorization.

21028883434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13259145.

The product of its (nonzero) digits is 294912, while the sum is 43.

The spelling of 21028883434 in words is "twenty-one billion, twenty-eight million, eight hundred eighty-three thousand, four hundred thirty-four".