21130401 has 8 divisors (see below), whose sum is σ = 28773504. Its totient is φ = 13787120.

The previous prime is 21130397. The next prime is 21130409. The reversal of 21130401 is 10403112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21130401 - 2² = 21130397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21130409) 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, 74790 + ... + 75071.

It is an arithmetic number, because the mean of its divisors is an integer number (3596688).

Almost surely, 2^21130401 is an apocalyptic number.

It is an amenable number.

21130401 is a deficient number, since it is larger than the sum of its proper divisors (7643103).

21130401 is a wasteful number, since it uses less digits than its factorization.

21130401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149911.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21130401 is about 4596.7815915051. The cubic root of 21130401 is about 276.4622975820.

Adding to 21130401 its reverse (10403112), we get a palindrome (31533513).

The spelling of 21130401 in words is "twenty-one million, one hundred thirty thousand, four hundred one".