20001221422 has 64 divisors (see below), whose sum is σ = 37458892800. Its totient is φ = 7798602240.

The previous prime is 20001221419. The next prime is 20001221437. The reversal of 20001221422 is 22412210002.

It is a junction number, because it is equal to n+sod(n) for n = 20001221396 and 20001221405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12666229 + ... + 12667807.

It is an arithmetic number, because the mean of its divisors is an integer number (585295200).

Almost surely, 2^20001221422 is an apocalyptic number.

20001221422 is a deficient number, since it is larger than the sum of its proper divisors (17457671378).

20001221422 is a wasteful number, since it uses less digits than its factorization.

20001221422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20001221422 its reverse (22412210002), we get a palindrome (42413431424).

The spelling of 20001221422 in words is "twenty billion, one million, two hundred twenty-one thousand, four hundred twenty-two".