40221010101221 has 2 divisors, whose sum is σ = 40221010101222. Its totient is φ = 40221010101220.

The previous prime is 40221010101197. The next prime is 40221010101263. The reversal of 40221010101221 is 12210101012204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20657152260196 + 19563857841025 = 4545014^2 + 4423105^2 .

It is a cyclic number.

It is not a de Polignac number, because 40221010101221 - 2³⁰ = 40219936359397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40221010101221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40221010131221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20110505050610 + 20110505050611.

It is an arithmetic number, because the mean of its divisors is an integer number (20110505050611).

Almost surely, 2^{40221010101221} is an apocalyptic number.

It is an amenable number.

40221010101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40221010101221 is an equidigital number, since it uses as much as digits as its factorization.

40221010101221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 40221010101221 its reverse (12210101012204), we get a palindrome (52431111113425).

The spelling of 40221010101221 in words is "forty trillion, two hundred twenty-one billion, ten million, one hundred one thousand, two hundred twenty-one".