21838851910 has 8 divisors (see below), whose sum is σ = 39309933456. Its totient is φ = 8735540760.

The previous prime is 21838851869. The next prime is 21838851941. The reversal of 21838851910 is 1915883812.

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

It is a congruent number.

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, 1091942586 + ... + 1091942605.

It is an arithmetic number, because the mean of its divisors is an integer number (4913741682).

Almost surely, 2^21838851910 is an apocalyptic number.

21838851910 is a deficient number, since it is larger than the sum of its proper divisors (17471081546).

21838851910 is a wasteful number, since it uses less digits than its factorization.

21838851910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183885198.

The product of its (nonzero) digits is 138240, while the sum is 46.

The spelling of 21838851910 in words is "twenty-one billion, eight hundred thirty-eight million, eight hundred fifty-one thousand, nine hundred ten".