21201221202 has 32 divisors (see below), whose sum is σ = 48511522944. Its totient is φ = 6051043200.

The previous prime is 21201221189. The next prime is 21201221207. The reversal of 21201221202 is 20212210212.

It is a super-2 number, since 2×21201221202² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21201221207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228699 + ... + 307742.

It is an arithmetic number, because the mean of its divisors is an integer number (1515985092).

Almost surely, 2^21201221202 is an apocalyptic number.

21201221202 is an abundant number, since it is smaller than the sum of its proper divisors (27310301742).

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

21201221202 is a wasteful number, since it uses less digits than its factorization.

21201221202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537394.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21201221202 its reverse (20212210212), we get a palindrome (41413431414).

The spelling of 21201221202 in words is "twenty-one billion, two hundred one million, two hundred twenty-one thousand, two hundred two".