21032401 has 8 divisors (see below), whose sum is σ = 22970304. Its totient is φ = 19140240.

The previous prime is 21032399. The next prime is 21032437. The reversal of 21032401 is 10423012.

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 21032401 - 2¹ = 21032399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032441) 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, 10471 + ... + 12316.

It is an arithmetic number, because the mean of its divisors is an integer number (2871288).

Almost surely, 2^21032401 is an apocalyptic number.

It is an amenable number.

21032401 is a deficient number, since it is larger than the sum of its proper divisors (1937903).

21032401 is a wasteful number, since it uses less digits than its factorization.

21032401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22871.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21032401 is about 4586.1095713033. The cubic root of 21032401 is about 276.0342366337.

Adding to 21032401 its reverse (10423012), we get a palindrome (31455413).

The spelling of 21032401 in words is "twenty-one million, thirty-two thousand, four hundred one".