221420266465547 has 2 divisors, whose sum is σ = 221420266465548. Its totient is φ = 221420266465546.

The previous prime is 221420266465477. The next prime is 221420266465553. The reversal of 221420266465547 is 745564662024122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221420266465547 - 2¹⁴ = 221420266449163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221420266465492 and 221420266465501.

It is not a weakly prime, because it can be changed into another prime (221420266435547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110710133232773 + 110710133232774.

It is an arithmetic number, because the mean of its divisors is an integer number (110710133232774).

Almost surely, 2^{221420266465547} is an apocalyptic number.

221420266465547 is a deficient number, since it is larger than the sum of its proper divisors (1).

221420266465547 is an equidigital number, since it uses as much as digits as its factorization.

221420266465547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38707200, while the sum is 56.

The spelling of 221420266465547 in words is "two hundred twenty-one trillion, four hundred twenty billion, two hundred sixty-six million, four hundred sixty-five thousand, five hundred forty-seven".