21800925826 has 4 divisors (see below), whose sum is σ = 32701388742. Its totient is φ = 10900462912.

The previous prime is 21800925821. The next prime is 21800925871. The reversal of 21800925826 is 62852900812.

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., 16160765625 + 5640160201 = 127125^2 + 75101^2 .

It is not an unprimeable number, because it can be changed into a prime (21800925821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5450231455 + ... + 5450231458.

Almost surely, 2^21800925826 is an apocalyptic number.

21800925826 is a deficient number, since it is larger than the sum of its proper divisors (10900462916).

21800925826 is a wasteful number, since it uses less digits than its factorization.

21800925826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10900462915.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 21800925826 in words is "twenty-one billion, eight hundred million, nine hundred twenty-five thousand, eight hundred twenty-six".