1221220220019 has 16 divisors (see below), whose sum is σ = 1689627988224. Its totient is φ = 784012975200.

The previous prime is 1221220219987. The next prime is 1221220220053. The reversal of 1221220220019 is 9100220221221.

It is not a de Polignac number, because 1221220220019 - 2⁵ = 1221220219987 is a prime.

It is a super-2 number, since 2×1221220220019² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221220220069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66658612 + ... + 66676929.

It is an arithmetic number, because the mean of its divisors is an integer number (105601749264).

Almost surely, 2^{1221220220019} is an apocalyptic number.

1221220220019 is a deficient number, since it is larger than the sum of its proper divisors (468407768205).

1221220220019 is a wasteful number, since it uses less digits than its factorization.

1221220220019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133335658.

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 1221220220019 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty thousand, nineteen".