21670074 has 12 divisors (see below), whose sum is σ = 46951866. Its totient is φ = 7223352.

The previous prime is 21670069. The next prime is 21670079. The reversal of 21670074 is 47007612.

It is an interprime number because it is at equal distance from previous prime (21670069) and next prime (21670079).

It can be written as a sum of positive squares in only one way, i.e., 11269449 + 10400625 = 3357^2 + 3225^2 .

It is not an unprimeable number, because it can be changed into a prime (21670079) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 601929 + ... + 601964.

Almost surely, 2^21670074 is an apocalyptic number.

21670074 is an abundant number, since it is smaller than the sum of its proper divisors (25281792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21670074 is a wasteful number, since it uses less digits than its factorization.

21670074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203901 (or 1203898 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 21670074 is about 4655.1126731799. The cubic root of 21670074 is about 278.7961666850.

Adding to 21670074 its reverse (47007612), we get a palindrome (68677686).

The spelling of 21670074 in words is "twenty-one million, six hundred seventy thousand, seventy-four".