21012092 has 6 divisors (see below), whose sum is σ = 36771168. Its totient is φ = 10506044.

The previous prime is 21012091. The next prime is 21012127. The reversal of 21012092 is 29021012.

It is a self number, because there is not a number n which added to its sum of digits gives 21012092.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626508 + ... + 2626515.

It is an arithmetic number, because the mean of its divisors is an integer number (6128528).

Almost surely, 2^21012092 is an apocalyptic number.

It is an amenable number.

21012092 is a deficient number, since it is larger than the sum of its proper divisors (15759076).

21012092 is a wasteful number, since it uses less digits than its factorization.

21012092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253027 (or 5253025 counting only the distinct ones).

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

The square root of 21012092 is about 4583.8948504520. The cubic root of 21012092 is about 275.9453613048.

The spelling of 21012092 in words is "twenty-one million, twelve thousand, ninety-two".