21120023403401 has 32 divisors (see below), whose sum is σ = 23097082176000. Its totient is φ = 19195974217728.

The previous prime is 21120023403389. The next prime is 21120023403439. The reversal of 21120023403401 is 10430432002112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120023403401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120023405401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147035345 + ... + 147178913.

It is an arithmetic number, because the mean of its divisors is an integer number (721783818000).

Almost surely, 2^{21120023403401} is an apocalyptic number.

It is an amenable number.

21120023403401 is a deficient number, since it is larger than the sum of its proper divisors (1977058772599).

21120023403401 is a wasteful number, since it uses less digits than its factorization.

21120023403401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144353.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21120023403401 its reverse (10430432002112), we get a palindrome (31550455405513).

The spelling of 21120023403401 in words is "twenty-one trillion, one hundred twenty billion, twenty-three million, four hundred three thousand, four hundred one".