21370658 has 4 divisors (see below), whose sum is σ = 32055990. Its totient is φ = 10685328.

The previous prime is 21370639. The next prime is 21370667. The reversal of 21370658 is 85607312.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 20912329 + 458329 = 4573^2 + 677^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5342663 + ... + 5342666.

Almost surely, 2^21370658 is an apocalyptic number.

21370658 is a deficient number, since it is larger than the sum of its proper divisors (10685332).

21370658 is a wasteful number, since it uses less digits than its factorization.

21370658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10685331.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 21370658 is about 4622.8409014371. The cubic root of 21370658 is about 277.5061622418.

The spelling of 21370658 in words is "twenty-one million, three hundred seventy thousand, six hundred fifty-eight".