221898220407 has 12 divisors (see below), whose sum is σ = 324576863520. Its totient is φ = 146059587648.

The previous prime is 221898220391. The next prime is 221898220457. The reversal of 221898220407 is 704022898122.

It is a happy number.

221898220407 is a `hidden beast` number, since 2 + 2 + 18 + 9 + 8 + 220 + 407 = 666.

It is not a de Polignac number, because 221898220407 - 2⁴ = 221898220391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221898220457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156045858 + ... + 156047279.

It is an arithmetic number, because the mean of its divisors is an integer number (27048071960).

Almost surely, 2^221898220407 is an apocalyptic number.

221898220407 is a deficient number, since it is larger than the sum of its proper divisors (102678643113).

221898220407 is a wasteful number, since it uses less digits than its factorization.

221898220407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312093222 (or 312093219 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 221898220407 in words is "two hundred twenty-one billion, eight hundred ninety-eight million, two hundred twenty thousand, four hundred seven".