221604424304646 has 64 divisors (see below), whose sum is σ = 460030917265920. Its totient is φ = 71081627984640.

The previous prime is 221604424304639. The next prime is 221604424304647. The reversal of 221604424304646 is 646403424406122.

It is a junction number, because it is equal to n+sod(n) for n = 221604424304595 and 221604424304604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221604424304647) 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, 388957341 + ... + 389526663.

It is an arithmetic number, because the mean of its divisors is an integer number (7187983082280).

Almost surely, 2^{221604424304646} is an apocalyptic number.

221604424304646 is an abundant number, since it is smaller than the sum of its proper divisors (238426492961274).

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

221604424304646 is a wasteful number, since it uses less digits than its factorization.

221604424304646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576861.

The product of its (nonzero) digits is 5308416, while the sum is 48.

The spelling of 221604424304646 in words is "two hundred twenty-one trillion, six hundred four billion, four hundred twenty-four million, three hundred four thousand, six hundred forty-six".