21424502 has 24 divisors (see below), whose sum is σ = 35571648. Its totient is φ = 9670320.

The previous prime is 21424499. The next prime is 21424511. The reversal of 21424502 is 20542412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53768 + ... + 54164.

It is an arithmetic number, because the mean of its divisors is an integer number (1482152).

Almost surely, 2^21424502 is an apocalyptic number.

21424502 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21424502 is a deficient number, since it is larger than the sum of its proper divisors (14147146).

21424502 is a wasteful number, since it uses less digits than its factorization.

21424502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 633 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 21424502 is about 4628.6609294698. The cubic root of 21424502 is about 277.7390284200.

Adding to 21424502 its reverse (20542412), we get a palindrome (41966914).

It can be divided in two parts, 2142450 and 2, that multiplied together give a square (4284900 = 2070²).

The spelling of 21424502 in words is "twenty-one million, four hundred twenty-four thousand, five hundred two".