221287384453 has 2 divisors, whose sum is σ = 221287384454. Its totient is φ = 221287384452.

The previous prime is 221287384441. The next prime is 221287384529. The reversal of 221287384453 is 354483782122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197263004449 + 24024380004 = 444143^2 + 154998^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221287384453 is a prime.

It is a super-2 number, since 2×221287384453² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221287384397 and 221287384406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221287385453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110643692226 + 110643692227.

It is an arithmetic number, because the mean of its divisors is an integer number (110643692227).

Almost surely, 2^221287384453 is an apocalyptic number.

It is an amenable number.

221287384453 is a deficient number, since it is larger than the sum of its proper divisors (1).

221287384453 is an equidigital number, since it uses as much as digits as its factorization.

221287384453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2580480, while the sum is 49.

The spelling of 221287384453 in words is "two hundred twenty-one billion, two hundred eighty-seven million, three hundred eighty-four thousand, four hundred fifty-three".