21220602 has 16 divisors (see below), whose sum is σ = 45706080. Its totient is φ = 6529392.

The previous prime is 21220601. The next prime is 21220613. The reversal of 21220602 is 20602212.

It is not an unprimeable number, because it can be changed into a prime (21220601) 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, 135952 + ... + 136107.

It is an arithmetic number, because the mean of its divisors is an integer number (2856630).

Almost surely, 2^21220602 is an apocalyptic number.

21220602 is an abundant number, since it is smaller than the sum of its proper divisors (24485478).

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

21220602 is a wasteful number, since it uses less digits than its factorization.

21220602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272077.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21220602 is about 4606.5824642570. The cubic root of 21220602 is about 276.8551245782.

Adding to 21220602 its reverse (20602212), we get a palindrome (41822814).

The spelling of 21220602 in words is "twenty-one million, two hundred twenty thousand, six hundred two".