21201192 has 24 divisors (see below), whose sum is σ = 57420090. Its totient is φ = 7067040.

The previous prime is 21201157. The next prime is 21201197. The reversal of 21201192 is 29110212.

It can be written as a sum of positive squares in only one way, i.e., 20848356 + 352836 = 4566^2 + 594^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21201197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147159 + ... + 147302.

Almost surely, 2^21201192 is an apocalyptic number.

It is an amenable number.

21201192 is an abundant number, since it is smaller than the sum of its proper divisors (36218898).

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

21201192 is a wasteful number, since it uses less digits than its factorization.

21201192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294473 (or 294466 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 21201192 is about 4604.4752143974. The cubic root of 21201192 is about 276.7706878090.

The spelling of 21201192 in words is "twenty-one million, two hundred one thousand, one hundred ninety-two".