221010021999979 has 2 divisors, whose sum is σ = 221010021999980. Its totient is φ = 221010021999978.

The previous prime is 221010021999959. The next prime is 221010022000087. The reversal of 221010021999979 is 979999120010122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221010021999979 - 2²⁷ = 221009887782251 is a prime.

It is a super-3 number, since 3×221010021999979³ (a number of 44 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (221010021999959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505010999989 + 110505010999990.

It is an arithmetic number, because the mean of its divisors is an integer number (110505010999990).

Almost surely, 2^{221010021999979} is an apocalyptic number.

221010021999979 is a deficient number, since it is larger than the sum of its proper divisors (1).

221010021999979 is an equidigital number, since it uses as much as digits as its factorization.

221010021999979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3306744, while the sum is 61.

It can be divided in two parts, 221010021 and 999979, that added together give a square (222010000 = 14900²).

The spelling of 221010021999979 in words is "two hundred twenty-one trillion, ten billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred seventy-nine".