21221121210202 has 8 divisors (see below), whose sum is σ = 32159843483796. Its totient is φ = 10501173382272.

The previous prime is 21221121210187. The next prime is 21221121210221. The reversal of 21221121210202 is 20201212112212.

It can be written as a sum of positive squares in 2 ways, for example, as 21207599939241 + 13521270961 = 4605171^2 + 116281^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21221121210202.

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, 54693611173 + ... + 54693611560.

Almost surely, 2^{21221121210202} is an apocalyptic number.

21221121210202 is a deficient number, since it is larger than the sum of its proper divisors (10938722273594).

21221121210202 is a wasteful number, since it uses less digits than its factorization.

21221121210202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109387222832.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221121210202 its reverse (20201212112212), we get a palindrome (41422333322414).

The spelling of 21221121210202 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred ten thousand, two hundred two".