21212202 has 16 divisors (see below), whose sum is σ = 46281312. Its totient is φ = 6427920.

The previous prime is 21212197. The next prime is 21212239. The reversal of 21212202 is 20221212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160633 + ... + 160764.

It is an arithmetic number, because the mean of its divisors is an integer number (2892582).

Almost surely, 2^21212202 is an apocalyptic number.

21212202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21212202 is an abundant number, since it is smaller than the sum of its proper divisors (25069110).

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

21212202 is a wasteful number, since it uses less digits than its factorization.

21212202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321413.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21212202 is about 4605.6706352061. The cubic root of 21212202 is about 276.8185894857.

Adding to 21212202 its reverse (20221212), we get a palindrome (41433414).

It can be divided in two parts, 21212 and 202, that multiplied together give a palindrome (4284824).

The spelling of 21212202 in words is "twenty-one million, two hundred twelve thousand, two hundred two".