221442120287 has 2 divisors, whose sum is σ = 221442120288. Its totient is φ = 221442120286.

The previous prime is 221442120269. The next prime is 221442120359. The reversal of 221442120287 is 782021244122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221442120287 - 2²⁰ = 221441071711 is a prime.

It is a super-2 number, since 2×221442120287² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221442120257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110721060143 + 110721060144.

It is an arithmetic number, because the mean of its divisors is an integer number (110721060144).

Almost surely, 2^221442120287 is an apocalyptic number.

221442120287 is a deficient number, since it is larger than the sum of its proper divisors (1).

221442120287 is an equidigital number, since it uses as much as digits as its factorization.

221442120287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28672, while the sum is 35.

The spelling of 221442120287 in words is "two hundred twenty-one billion, four hundred forty-two million, one hundred twenty thousand, two hundred eighty-seven".