21101221202 has 16 divisors (see below), whose sum is σ = 33517382040. Its totient is φ = 9928896768.

The previous prime is 21101221201. The next prime is 21101221213. The reversal of 21101221202 is 20212210112.

It can be written as a sum of positive squares in 4 ways, for example, as 20848760881 + 252460321 = 144391^2 + 15889^2 .

It is not an unprimeable number, because it can be changed into a prime (21101221201) 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, 339824 + ... + 397092.

Almost surely, 2^21101221202 is an apocalyptic number.

21101221202 is a deficient number, since it is larger than the sum of its proper divisors (12416160838).

21101221202 is a wasteful number, since it uses less digits than its factorization.

21101221202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68125.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21101221202 its reverse (20212210112), we get a palindrome (41313431314).

The spelling of 21101221202 in words is "twenty-one billion, one hundred one million, two hundred twenty-one thousand, two hundred two".