21220270 has 32 divisors (see below), whose sum is σ = 39152160. Its totient is φ = 8279040.

The previous prime is 21220261. The next prime is 21220313. The reversal of 21220270 is 7202212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100465 + ... + 100675.

It is an arithmetic number, because the mean of its divisors is an integer number (1223505).

Almost surely, 2^21220270 is an apocalyptic number.

21220270 is a deficient number, since it is larger than the sum of its proper divisors (17931890).

21220270 is a wasteful number, since it uses less digits than its factorization.

21220270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 21220270 is about 4606.5464287251. The cubic root of 21220270 is about 276.8536807552.

Adding to 21220270 its reverse (7202212), we get a palindrome (28422482).

The spelling of 21220270 in words is "twenty-one million, two hundred twenty thousand, two hundred seventy".