20122401221 has 8 divisors (see below), whose sum is σ = 21763287000. Its totient is φ = 18494802432.

The previous prime is 20122401149. The next prime is 20122401223. The reversal of 20122401221 is 12210422102.

It can be written as a sum of positive squares in 4 ways, for example, as 1405425121 + 18716976100 = 37489^2 + 136810^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20122401221 - 2¹⁴ = 20122384837 is a prime.

It is a super-2 number, since 2×20122401221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20122401221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122401223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3318596 + ... + 3324653.

It is an arithmetic number, because the mean of its divisors is an integer number (2720410875).

Almost surely, 2^20122401221 is an apocalyptic number.

It is an amenable number.

20122401221 is a deficient number, since it is larger than the sum of its proper divisors (1640885779).

20122401221 is a wasteful number, since it uses less digits than its factorization.

20122401221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6643495.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20122401221 its reverse (12210422102), we get a palindrome (32332823323).

The spelling of 20122401221 in words is "twenty billion, one hundred twenty-two million, four hundred one thousand, two hundred twenty-one".