40121111222021 has 2 divisors, whose sum is σ = 40121111222022. Its totient is φ = 40121111222020.

The previous prime is 40121111221897. The next prime is 40121111222033. The reversal of 40121111222021 is 12022211112104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34586619719521 + 5534491502500 = 5881039^2 + 2352550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40121111222021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40121111221984 and 40121111222002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40121111221021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060555611010 + 20060555611011.

It is an arithmetic number, because the mean of its divisors is an integer number (20060555611011).

Almost surely, 2^{40121111222021} is an apocalyptic number.

It is an amenable number.

40121111222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121111222021 is an equidigital number, since it uses as much as digits as its factorization.

40121111222021 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 20.

Adding to 40121111222021 its reverse (12022211112104), we get a palindrome (52143322334125).

The spelling of 40121111222021 in words is "forty trillion, one hundred twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, twenty-one".