21940192 has 12 divisors (see below), whose sum is σ = 43194816. Its totient is φ = 10970080.

The previous prime is 21940189. The next prime is 21940201. The reversal of 21940192 is 29104912.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21940192.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342784 + ... + 342847.

It is an arithmetic number, because the mean of its divisors is an integer number (3599568).

Almost surely, 2^21940192 is an apocalyptic number.

It is an amenable number.

21940192 is a deficient number, since it is larger than the sum of its proper divisors (21254624).

21940192 is an equidigital number, since it uses as much as digits as its factorization.

21940192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685641 (or 685633 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 21940192 is about 4684.0358666432. The cubic root of 21940192 is about 279.9497869141.

The spelling of 21940192 in words is "twenty-one million, nine hundred forty thousand, one hundred ninety-two".