21212222202 has 48 divisors (see below), whose sum is σ = 48015494280. Its totient is φ = 6759312000.

The previous prime is 21212222201. The next prime is 21212222233. The reversal of 21212222202 is 20222221212.

It can be written as a sum of positive squares in 4 ways, for example, as 19600280001 + 1611942201 = 140001^2 + 40149^2 .

It is a super-3 number, since 3×21212222202³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21212222201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148449 + ... + 253892.

Almost surely, 2^21212222202 is an apocalyptic number.

21212222202 is an abundant number, since it is smaller than the sum of its proper divisors (26803272078).

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

21212222202 is a wasteful number, since it uses less digits than its factorization.

21212222202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402479 (or 402476 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21212222202 its reverse (20222221212), we get a palindrome (41434443414).

The spelling of 21212222202 in words is "twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred two".