21369310 has 16 divisors (see below), whose sum is σ = 38520000. Its totient is φ = 8535456.

The previous prime is 21369253. The next prime is 21369311. The reversal of 21369310 is 1396312.

It is a super-2 number, since 2×21369310² = 913294819752200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9691 + ... + 11689.

It is an arithmetic number, because the mean of its divisors is an integer number (2407500).

Almost surely, 2^21369310 is an apocalyptic number.

21369310 is a deficient number, since it is larger than the sum of its proper divisors (17150690).

21369310 is a wasteful number, since it uses less digits than its factorization.

21369310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 21369310 is about 4622.6951013451. The cubic root of 21369310 is about 277.5003273540.

The spelling of 21369310 in words is "twenty-one million, three hundred sixty-nine thousand, three hundred ten".