20001221122 has 8 divisors (see below), whose sum is σ = 30013131276. Its totient is φ = 9996844032.

The previous prime is 20001221083. The next prime is 20001221137. The reversal of 20001221122 is 22112210002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19734911361 + 266309761 = 140481^2 + 16319^2 .

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

It is a super-2 number, since 2×20001221122² (a number of 21 digits) contains 22 as substring.

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, 1876623 + ... + 1887250.

Almost surely, 2^20001221122 is an apocalyptic number.

20001221122 is a deficient number, since it is larger than the sum of its proper divisors (10011910154).

20001221122 is a wasteful number, since it uses less digits than its factorization.

20001221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766532.

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

Adding to 20001221122 its reverse (22112210002), we get a palindrome (42113431124).

The spelling of 20001221122 in words is "twenty billion, one million, two hundred twenty-one thousand, one hundred twenty-two".