21730074 has 32 divisors (see below), whose sum is σ = 44706816. Its totient is φ = 7038000.

The previous prime is 21730067. The next prime is 21730099. The reversal of 21730074 is 47003712.

It is a super-2 number, since 2×21730074² = 944392232090952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70629 + ... + 70935.

It is an arithmetic number, because the mean of its divisors is an integer number (1397088).

Almost surely, 2^21730074 is an apocalyptic number.

21730074 is an abundant number, since it is smaller than the sum of its proper divisors (22976742).

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

21730074 is a wasteful number, since it uses less digits than its factorization.

21730074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 21730074 is about 4661.5527455988. The cubic root of 21730074 is about 279.0532394129.

Adding to 21730074 its reverse (47003712), we get a palindrome (68733786).

The spelling of 21730074 in words is "twenty-one million, seven hundred thirty thousand, seventy-four".