21873401 has 16 divisors (see below), whose sum is σ = 24718848. Its totient is φ = 19180800.

The previous prime is 21873361. The next prime is 21873409. The reversal of 21873401 is 10437812.

It is not a de Polignac number, because 21873401 - 2¹⁰ = 21872377 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21873409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90641 + ... + 90881.

It is an arithmetic number, because the mean of its divisors is an integer number (1544928).

Almost surely, 2^21873401 is an apocalyptic number.

It is an amenable number.

21873401 is a deficient number, since it is larger than the sum of its proper divisors (2845447).

21873401 is a wasteful number, since it uses less digits than its factorization.

21873401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21873401 is about 4676.9007900532. The cubic root of 21873401 is about 279.6654209405.

The spelling of 21873401 in words is "twenty-one million, eight hundred seventy-three thousand, four hundred one".