21897038 has 4 divisors (see below), whose sum is σ = 32845560. Its totient is φ = 10948518.

The previous prime is 21897017. The next prime is 21897053. The reversal of 21897038 is 83079812.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21896992 and 21897010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5474258 + ... + 5474261.

It is an arithmetic number, because the mean of its divisors is an integer number (8211390).

Almost surely, 2^21897038 is an apocalyptic number.

21897038 is a deficient number, since it is larger than the sum of its proper divisors (10948522).

21897038 is a wasteful number, since it uses less digits than its factorization.

21897038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10948521.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 21897038 is about 4679.4271016867. The cubic root of 21897038 is about 279.7661227295.

The spelling of 21897038 in words is "twenty-one million, eight hundred ninety-seven thousand, thirty-eight".