221296858085 has 16 divisors (see below), whose sum is σ = 268287384816. Its totient is φ = 175226032128.

The previous prime is 221296858061. The next prime is 221296858093. The reversal of 221296858085 is 580858692122.

It is a Cunningham number, because it is equal to 470422²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 29241684004 + 192055174081 = 171002^2 + 438241^2 .

It is a cyclic number.

It is not a de Polignac number, because 221296858085 - 2⁸ = 221296857829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221296858085.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391934 + ... + 772143.

It is an arithmetic number, because the mean of its divisors is an integer number (16767961551).

Almost surely, 2^221296858085 is an apocalyptic number.

It is an amenable number.

221296858085 is a deficient number, since it is larger than the sum of its proper divisors (46990526731).

221296858085 is a wasteful number, since it uses less digits than its factorization.

221296858085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164472.

The product of its (nonzero) digits is 5529600, while the sum is 56.

The spelling of 221296858085 in words is "two hundred twenty-one billion, two hundred ninety-six million, eight hundred fifty-eight thousand, eighty-five".