21471246 has 12 divisors (see below), whose sum is σ = 46521072. Its totient is φ = 7157076.

The previous prime is 21471239. The next prime is 21471257. The reversal of 21471246 is 64217412.

It is a super-2 number, since 2×21471246² = 922028809585032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 596406 + ... + 596441.

It is an arithmetic number, because the mean of its divisors is an integer number (3876756).

Almost surely, 2^21471246 is an apocalyptic number.

21471246 is an abundant number, since it is smaller than the sum of its proper divisors (25049826).

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

21471246 is a wasteful number, since it uses less digits than its factorization.

21471246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192855 (or 1192852 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 21471246 is about 4633.7075868035. The cubic root of 21471246 is about 277.9408721273.

Adding to 21471246 its reverse (64217412), we get a palindrome (85688658).

It can be divided in two parts, 2 and 1471246, that multiplied together give a palindrome (2942492).

The spelling of 21471246 in words is "twenty-one million, four hundred seventy-one thousand, two hundred forty-six".