221212022201998 has 4 divisors (see below), whose sum is σ = 331818033303000. Its totient is φ = 110606011100998.

The previous prime is 221212022201983. The next prime is 221212022201999. The reversal of 221212022201998 is 899102220212122.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212022201999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55303005550498 + ... + 55303005550501.

It is an arithmetic number, because the mean of its divisors is an integer number (82954508325750).

Almost surely, 2^{221212022201998} is an apocalyptic number.

221212022201998 is a deficient number, since it is larger than the sum of its proper divisors (110606011101002).

221212022201998 is a wasteful number, since it uses less digits than its factorization.

221212022201998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110606011101001.

The product of its (nonzero) digits is 82944, while the sum is 43.

The spelling of 221212022201998 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-two million, two hundred one thousand, nine hundred ninety-eight".