21424002 has 32 divisors (see below), whose sum is σ = 43775424. Its totient is φ = 6988800.

The previous prime is 21423989. The next prime is 21424003. The reversal of 21424002 is 20042412.

It is not an unprimeable number, because it can be changed into a prime (21424003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76102 + ... + 76382.

It is an arithmetic number, because the mean of its divisors is an integer number (1367982).

Almost surely, 2^21424002 is an apocalyptic number.

21424002 is an abundant number, since it is smaller than the sum of its proper divisors (22351422).

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

21424002 is a wasteful number, since it uses less digits than its factorization.

21424002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 21424002 is about 4628.6069178534. The cubic root of 21424002 is about 277.7368678004.

Adding to 21424002 its reverse (20042412), we get a palindrome (41466414).

The spelling of 21424002 in words is "twenty-one million, four hundred twenty-four thousand, two".