21120214001 has 4 divisors (see below), whose sum is σ = 21128123904. Its totient is φ = 21112304100.

The previous prime is 21120213977. The next prime is 21120214007. The reversal of 21120214001 is 10041202112.

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 a de Polignac number, because none of the positive numbers 2^k-21120214001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120214007) 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, 3950945 + ... + 3956286.

It is an arithmetic number, because the mean of its divisors is an integer number (5282030976).

Almost surely, 2^21120214001 is an apocalyptic number.

It is an amenable number.

21120214001 is a deficient number, since it is larger than the sum of its proper divisors (7909903).

21120214001 is an equidigital number, since it uses as much as digits as its factorization.

21120214001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7909902.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21120214001 its reverse (10041202112), we get a palindrome (31161416113).

The spelling of 21120214001 in words is "twenty-one billion, one hundred twenty million, two hundred fourteen thousand, one".