21101330 has 8 divisors (see below), whose sum is σ = 37982412. Its totient is φ = 8440528.

The previous prime is 21101323. The next prime is 21101341. The reversal of 21101330 is 3310112.

It can be written as a sum of positive squares in 2 ways, for example, as 20584369 + 516961 = 4537^2 + 719^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21101330² = 890532255537800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055057 + ... + 1055076.

Almost surely, 2^21101330 is an apocalyptic number.

21101330 is a deficient number, since it is larger than the sum of its proper divisors (16881082).

21101330 is a wasteful number, since it uses less digits than its factorization.

21101330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110140.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21101330 is about 4593.6183994755. The cubic root of 21101330 is about 276.3354546819.

Adding to 21101330 its reverse (3310112), we get a palindrome (24411442).

The spelling of 21101330 in words is "twenty-one million, one hundred one thousand, three hundred thirty".