21220101202 has 4 divisors (see below), whose sum is σ = 31830151806. Its totient is φ = 10610050600.

The previous prime is 21220101187. The next prime is 21220101209. The reversal of 21220101202 is 20210102212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16146530761 + 5073570441 = 127069^2 + 71229^2 .

It is not an unprimeable number, because it can be changed into a prime (21220101209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305025299 + ... + 5305025302.

Almost surely, 2^21220101202 is an apocalyptic number.

21220101202 is a deficient number, since it is larger than the sum of its proper divisors (10610050604).

21220101202 is a wasteful number, since it uses less digits than its factorization.

21220101202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610050603.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21220101202 its reverse (20210102212), we get a palindrome (41430203414).

It can be divided in two parts, 2122010 and 1202, that added together give a palindrome (2123212).

The spelling of 21220101202 in words is "twenty-one billion, two hundred twenty million, one hundred one thousand, two hundred two".