21228074 has 24 divisors (see below), whose sum is σ = 37231488. Its totient is φ = 9051000.

The previous prime is 21228059. The next prime is 21228089. The reversal of 21228074 is 47082212.

It is an interprime number because it is at equal distance from previous prime (21228059) and next prime (21228089).

It is a super-2 number, since 2×21228074² = 901262251498952, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24167 + ... + 25029.

It is an arithmetic number, because the mean of its divisors is an integer number (1551312).

Almost surely, 2^21228074 is an apocalyptic number.

21228074 is a deficient number, since it is larger than the sum of its proper divisors (16003414).

21228074 is a wasteful number, since it uses less digits than its factorization.

21228074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130 (or 1123 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 21228074 is about 4607.3934062548. The cubic root of 21228074 is about 276.8876153111.

The spelling of 21228074 in words is "twenty-one million, two hundred twenty-eight thousand, seventy-four".