20001121222210 has 32 divisors (see below), whose sum is σ = 36036625941360. Its totient is φ = 7992761561088.

The previous prime is 20001121222073. The next prime is 20001121222213. The reversal of 20001121222210 is 1222212110002.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5488472877001 + 14512648345209 = 2342749^2 + 3809547^2 .

It is not an unprimeable number, because it can be changed into a prime (20001121222213) 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, 43637106 + ... + 44093074.

Almost surely, 2^{20001121222210} is an apocalyptic number.

20001121222210 is a deficient number, since it is larger than the sum of its proper divisors (16035504719150).

20001121222210 is a wasteful number, since it uses less digits than its factorization.

20001121222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460182.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20001121222210 its reverse (1222212110002), we get a palindrome (21223333332212).

The spelling of 20001121222210 in words is "twenty trillion, one billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred ten".