21312221202 has 48 divisors (see below), whose sum is σ = 47922245280. Its totient is φ = 7098803712.

The previous prime is 21312221201. The next prime is 21312221213. The reversal of 21312221202 is 20212221312.

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 (21312221201) 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, 669213 + ... + 700335.

It is an arithmetic number, because the mean of its divisors is an integer number (998380110).

Almost surely, 2^21312221202 is an apocalyptic number.

21312221202 is an abundant number, since it is smaller than the sum of its proper divisors (26610024078).

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

21312221202 is a wasteful number, since it uses less digits than its factorization.

21312221202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32549 (or 32537 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21312221202 its reverse (20212221312), we get a palindrome (41524442514).

The spelling of 21312221202 in words is "twenty-one billion, three hundred twelve million, two hundred twenty-one thousand, two hundred two".