402224400221 has 6 divisors (see below), whose sum is σ = 467893690110. Its totient is φ = 344763771576.

The previous prime is 402224400163. The next prime is 402224400233. The reversal of 402224400221 is 122004422204.

It can be written as a sum of positive squares in only one way, i.e., 398577568900 + 3646831321 = 631330^2 + 60389^2 .

It is not a de Polignac number, because 402224400221 - 2⁶ = 402224400157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402224400251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4104330566 + ... + 4104330663.

It is an arithmetic number, because the mean of its divisors is an integer number (77982281685).

Almost surely, 2^402224400221 is an apocalyptic number.

It is an amenable number.

402224400221 is a deficient number, since it is larger than the sum of its proper divisors (65669289889).

402224400221 is an equidigital number, since it uses as much as digits as its factorization.

402224400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8208661243 (or 8208661236 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 402224400221 its reverse (122004422204), we get a palindrome (524228822425).

The spelling of 402224400221 in words is "four hundred two billion, two hundred twenty-four million, four hundred thousand, two hundred twenty-one".