21011220202202 has 8 divisors (see below), whose sum is σ = 31516858393716. Its totient is φ = 10505600737632.

The previous prime is 21011220202183. The next prime is 21011220202229. The reversal of 21011220202202 is 20220202211012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20853461100481 + 157759101721 = 4566559^2 + 397189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1423193 + ... + 6636860.

Almost surely, 2^{21011220202202} is an apocalyptic number.

21011220202202 is a deficient number, since it is larger than the sum of its proper divisors (10505638191514).

21011220202202 is a wasteful number, since it uses less digits than its factorization.

21011220202202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9363472.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21011220202202 its reverse (20220202211012), we get a palindrome (41231422413214).

The spelling of 21011220202202 in words is "twenty-one trillion, eleven billion, two hundred twenty million, two hundred two thousand, two hundred two".