401201222021 has 2 divisors, whose sum is σ = 401201222022. Its totient is φ = 401201222020.

The previous prime is 401201221973. The next prime is 401201222077. The reversal of 401201222021 is 120222102104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 399912052996 + 1289169025 = 632386^2 + 35905^2 .

It is a cyclic number.

It is not a de Polignac number, because 401201222021 - 2¹⁴ = 401201205637 is a prime.

It is a super-2 number, since 2×401201222021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401201222221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200600611010 + 200600611011.

It is an arithmetic number, because the mean of its divisors is an integer number (200600611011).

Almost surely, 2^401201222021 is an apocalyptic number.

It is an amenable number.

401201222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

401201222021 is an equidigital number, since it uses as much as digits as its factorization.

401201222021 is an evil number, because the sum of its binary digits is even.

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

Adding to 401201222021 its reverse (120222102104), we get a palindrome (521423324125).

The spelling of 401201222021 in words is "four hundred one billion, two hundred one million, two hundred twenty-two thousand, twenty-one".