21221111221019 has 2 divisors, whose sum is σ = 21221111221020. Its totient is φ = 21221111221018.

The previous prime is 21221111220949. The next prime is 21221111221043. The reversal of 21221111221019 is 91012211112212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221111221019 - 2⁸ = 21221111220763 is a prime.

It is a super-2 number, since 2×21221111221019² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21221111221069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610555610509 + 10610555610510.

It is an arithmetic number, because the mean of its divisors is an integer number (10610555610510).

Almost surely, 2^{21221111221019} is an apocalyptic number.

21221111221019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221111221019 is an equidigital number, since it uses as much as digits as its factorization.

21221111221019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 21221111221019 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, nineteen".