21021110092 has 12 divisors (see below), whose sum is σ = 36791889120. Its totient is φ = 10509141776.

The previous prime is 21021110063. The next prime is 21021110093. The reversal of 21021110092 is 29001112012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21021110093) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 319492 + ... + 379627.

It is an arithmetic number, because the mean of its divisors is an integer number (3065990760).

Almost surely, 2^21021110092 is an apocalyptic number.

It is an amenable number.

21021110092 is a deficient number, since it is larger than the sum of its proper divisors (15770779028).

21021110092 is a wasteful number, since it uses less digits than its factorization.

21021110092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706640 (or 706638 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 21021110092 in words is "twenty-one billion, twenty-one million, one hundred ten thousand, ninety-two".