21311123032001 has 4 divisors (see below), whose sum is σ = 23248497853104. Its totient is φ = 19373748210900.

The previous prime is 21311123031997. The next prime is 21311123032019. The reversal of 21311123032001 is 10023032111312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21311123032001 - 2² = 21311123031997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311123035001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968687410535 + ... + 968687410556.

It is an arithmetic number, because the mean of its divisors is an integer number (5812124463276).

Almost surely, 2^{21311123032001} is an apocalyptic number.

It is an amenable number.

21311123032001 is a deficient number, since it is larger than the sum of its proper divisors (1937374821103).

21311123032001 is a wasteful number, since it uses less digits than its factorization.

21311123032001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937374821102.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21311123032001 its reverse (10023032111312), we get a palindrome (31334155143313).

The spelling of 21311123032001 in words is "twenty-one trillion, three hundred eleven billion, one hundred twenty-three million, thirty-two thousand, one".