21222502 has 16 divisors (see below), whose sum is σ = 37269792. Its totient is φ = 8873280.

The previous prime is 21222499. The next prime is 21222503. The reversal of 21222502 is 20522212.

It is a super-3 number, since 3×21222502³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17913 + ... + 19060.

It is an arithmetic number, because the mean of its divisors is an integer number (2329362).

Almost surely, 2^21222502 is an apocalyptic number.

21222502 is a deficient number, since it is larger than the sum of its proper divisors (16047290).

21222502 is a wasteful number, since it uses less digits than its factorization.

21222502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37023.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 21222502 is about 4606.7886862759. The cubic root of 21222502 is about 276.8633871310.

Adding to 21222502 its reverse (20522212), we get a palindrome (41744714).

It can be divided in two parts, 2122 and 2502, that added together give a square (4624 = 68²).

The spelling of 21222502 in words is "twenty-one million, two hundred twenty-two thousand, five hundred two".