21201200192 has 14 divisors (see below), whose sum is σ = 42071131758. Its totient is φ = 10600600064.

The previous prime is 21201200177. The next prime is 21201200221. The reversal of 21201200192 is 29100210212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20809793536 + 391406656 = 144256^2 + 19784^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165634313 + ... + 165634440.

Almost surely, 2^21201200192 is an apocalyptic number.

It is an amenable number.

21201200192 is a deficient number, since it is larger than the sum of its proper divisors (20869931566).

21201200192 is an equidigital number, since it uses as much as digits as its factorization.

21201200192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331268765 (or 331268755 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21201200192 in words is "twenty-one billion, two hundred one million, two hundred thousand, one hundred ninety-two".