20401221001222 has 4 divisors (see below), whose sum is σ = 30601831501836. Its totient is φ = 10200610500610.

The previous prime is 20401221001211. The next prime is 20401221001223. The reversal of 20401221001222 is 22210012210402.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20401221001222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401221001223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100305250304 + ... + 5100305250307.

It is an arithmetic number, because the mean of its divisors is an integer number (7650457875459).

Almost surely, 2^{20401221001222} is an apocalyptic number.

20401221001222 is a deficient number, since it is larger than the sum of its proper divisors (10200610500614).

20401221001222 is a wasteful number, since it uses less digits than its factorization.

20401221001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200610500613.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20401221001222 its reverse (22210012210402), we get a palindrome (42611233211624).

The spelling of 20401221001222 in words is "twenty trillion, four hundred one billion, two hundred twenty-one million, one thousand, two hundred twenty-two".