21190370 has 16 divisors (see below), whose sum is σ = 38216448. Its totient is φ = 8459760.

The previous prime is 21190349. The next prime is 21190409. The reversal of 21190370 is 7309112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4325 + ... + 7815.

It is an arithmetic number, because the mean of its divisors is an integer number (2388528).

Almost surely, 2^21190370 is an apocalyptic number.

21190370 is a deficient number, since it is larger than the sum of its proper divisors (17026078).

21190370 is a wasteful number, since it uses less digits than its factorization.

21190370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 21190370 is about 4603.2999033302. The cubic root of 21190370 is about 276.7235879076.

Adding to 21190370 its reverse (7309112), we get a palindrome (28499482).

The spelling of 21190370 in words is "twenty-one million, one hundred ninety thousand, three hundred seventy".