21426282 has 24 divisors (see below), whose sum is σ = 48144096. Its totient is φ = 7141932.

The previous prime is 21426277. The next prime is 21426287. The reversal of 21426282 is 28262412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21426277) and next prime (21426287).

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

It is not an unprimeable number, because it can be changed into a prime (21426287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21558 + ... + 22529.

It is an arithmetic number, because the mean of its divisors is an integer number (2006004).

Almost surely, 2^21426282 is an apocalyptic number.

21426282 is an abundant number, since it is smaller than the sum of its proper divisors (26717814).

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

21426282 is an equidigital number, since it uses as much as digits as its factorization.

21426282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44104 (or 44092 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 21426282 is about 4628.8532057087. The cubic root of 21426282 is about 277.7467199528.

Adding to 21426282 its reverse (28262412), we get a palindrome (49688694).

The spelling of 21426282 in words is "twenty-one million, four hundred twenty-six thousand, two hundred eighty-two".