21201122099998 has 32 divisors (see below), whose sum is σ = 32971274013600. Its totient is φ = 10212322627584.

The previous prime is 21201122099873. The next prime is 21201122099999. The reversal of 21201122099998 is 89999022110212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201122099999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 514857186 + ... + 514898362.

It is an arithmetic number, because the mean of its divisors is an integer number (1030352312925).

Almost surely, 2^{21201122099998} is an apocalyptic number.

21201122099998 is a deficient number, since it is larger than the sum of its proper divisors (11770151913602).

21201122099998 is a wasteful number, since it uses less digits than its factorization.

21201122099998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60684.

The product of its (nonzero) digits is 839808, while the sum is 55.

The spelling of 21201122099998 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-two million, ninety-nine thousand, nine hundred ninety-eight".