221983986953 has 2 divisors, whose sum is σ = 221983986954. Its totient is φ = 221983986952.

The previous prime is 221983986949. The next prime is 221983987009. The reversal of 221983986953 is 359689389122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156636267529 + 65347719424 = 395773^2 + 255632^2 .

It is a cyclic number.

It is not a de Polignac number, because 221983986953 - 2² = 221983986949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221983986953.

It is not a weakly prime, because it can be changed into another prime (221983986853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110991993476 + 110991993477.

It is an arithmetic number, because the mean of its divisors is an integer number (110991993477).

Almost surely, 2^221983986953 is an apocalyptic number.

It is an amenable number.

221983986953 is a deficient number, since it is larger than the sum of its proper divisors (1).

221983986953 is an equidigital number, since it uses as much as digits as its factorization.

221983986953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50388480, while the sum is 65.

The spelling of 221983986953 in words is "two hundred twenty-one billion, nine hundred eighty-three million, nine hundred eighty-six thousand, nine hundred fifty-three".