21102092 has 12 divisors (see below), whose sum is σ = 40285896. Its totient is φ = 9591840.

The previous prime is 21102091. The next prime is 21102101. The reversal of 21102092 is 29020112.

It is a self number, because there is not a number n which added to its sum of digits gives 21102092.

It is not an unprimeable number, because it can be changed into a prime (21102091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239753 + ... + 239840.

It is an arithmetic number, because the mean of its divisors is an integer number (3357158).

Almost surely, 2^21102092 is an apocalyptic number.

21102092 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21102092 is a deficient number, since it is larger than the sum of its proper divisors (19183804).

21102092 is a wasteful number, since it uses less digits than its factorization.

21102092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479608 (or 479606 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 21102092 is about 4593.7013398783. The cubic root of 21102092 is about 276.3387809348.

It can be divided in two parts, 211020 and 92, that added together give a palindrome (211112).

The spelling of 21102092 in words is "twenty-one million, one hundred two thousand, ninety-two".