221135297994 has 64 divisors (see below), whose sum is σ = 529376601600. Its totient is φ = 68020554816.

The previous prime is 221135297993. The next prime is 221135298001. The reversal of 221135297994 is 499792531122.

It is a happy number.

221135297994 is a `hidden beast` number, since 2 + 21 + 1 + 3 + 529 + 7 + 9 + 94 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 221135297994.

It is not an unprimeable number, because it can be changed into a prime (221135297993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2299672 + ... + 2393900.

It is an arithmetic number, because the mean of its divisors is an integer number (8271509400).

Almost surely, 2^221135297994 is an apocalyptic number.

221135297994 is an abundant number, since it is smaller than the sum of its proper divisors (308241303606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221135297994 is a wasteful number, since it uses less digits than its factorization.

221135297994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97596 (or 97590 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The spelling of 221135297994 in words is "two hundred twenty-one billion, one hundred thirty-five million, two hundred ninety-seven thousand, nine hundred ninety-four".