21472074 has 64 divisors (see below), whose sum is σ = 52214400. Its totient is φ = 6500736.

The previous prime is 21472063. The next prime is 21472081. The reversal of 21472074 is 47027412.

It is a happy number.

It is a super-2 number, since 2×21472074² = 922099923722952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51037 + ... + 51455.

It is an arithmetic number, because the mean of its divisors is an integer number (815850).

Almost surely, 2^21472074 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21472074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26107200).

21472074 is an abundant number, since it is smaller than the sum of its proper divisors (30742326).

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

21472074 is a wasteful number, since it uses less digits than its factorization.

21472074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 21472074 is about 4633.7969312433. The cubic root of 21472074 is about 277.9444448447.

Adding to 21472074 its reverse (47027412), we get a palindrome (68499486).

The spelling of 21472074 in words is "twenty-one million, four hundred seventy-two thousand, seventy-four".