21858092 has 6 divisors (see below), whose sum is σ = 38251668. Its totient is φ = 10929044.

The previous prime is 21858029. The next prime is 21858127. The reversal of 21858092 is 29085812.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2732258 + ... + 2732265.

It is an arithmetic number, because the mean of its divisors is an integer number (6375278).

Almost surely, 2^21858092 is an apocalyptic number.

It is an amenable number.

21858092 is a deficient number, since it is larger than the sum of its proper divisors (16393576).

21858092 is a wasteful number, since it uses less digits than its factorization.

21858092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5464527 (or 5464525 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 21858092 is about 4675.2638428221. The cubic root of 21858092 is about 279.6001605945.

The spelling of 21858092 in words is "twenty-one million, eight hundred fifty-eight thousand, ninety-two".