1000012020221 has 2 divisors, whose sum is σ = 1000012020222. Its totient is φ = 1000012020220.

The previous prime is 1000012020187. The next prime is 1000012020233. The reversal of 1000012020221 is 1220202100001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687962419225 + 312049600996 = 829435^2 + 558614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000012020221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000012020121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500006010110 + 500006010111.

It is an arithmetic number, because the mean of its divisors is an integer number (500006010111).

Almost surely, 2^{1000012020221} is an apocalyptic number.

It is an amenable number.

1000012020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000012020221 is an equidigital number, since it uses as much as digits as its factorization.

1000012020221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1000012020221 its reverse (1220202100001), we get a palindrome (2220214120222).

The spelling of 1000012020221 in words is "one trillion, twelve million, twenty thousand, two hundred twenty-one".