21894409401 has 8 divisors (see below), whose sum is σ = 30134241024. Its totient is φ = 14125425360.

The previous prime is 21894409399. The next prime is 21894409451. The reversal of 21894409401 is 10490449812.

It is a happy number.

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

It is not a de Polignac number, because 21894409401 - 2¹ = 21894409399 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21894409451) 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, 117711786 + ... + 117711971.

It is an arithmetic number, because the mean of its divisors is an integer number (3766780128).

Almost surely, 2^21894409401 is an apocalyptic number.

It is an amenable number.

21894409401 is a deficient number, since it is larger than the sum of its proper divisors (8239831623).

21894409401 is a wasteful number, since it uses less digits than its factorization.

21894409401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235423791.

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 21894409401 in words is "twenty-one billion, eight hundred ninety-four million, four hundred nine thousand, four hundred one".