21970898 has 8 divisors (see below), whose sum is σ = 33069708. Its totient is φ = 10947664.

The previous prime is 21970891. The next prime is 21970901. The reversal of 21970898 is 89807912.

It can be written as a sum of positive squares in 2 ways, for example, as 21557449 + 413449 = 4643^2 + 643^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21970891) 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, 18161 + ... + 19332.

Almost surely, 2^21970898 is an apocalyptic number.

21970898 is a deficient number, since it is larger than the sum of its proper divisors (11098810).

21970898 is a wasteful number, since it uses less digits than its factorization.

21970898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37788.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 21970898 is about 4687.3124495813. The cubic root of 21970898 is about 280.0803255937.

It can be divided in two parts, 219 and 70898, that added together give a palindrome (71117).

The spelling of 21970898 in words is "twenty-one million, nine hundred seventy thousand, eight hundred ninety-eight".