21012333401 has 2 divisors, whose sum is σ = 21012333402. Its totient is φ = 21012333400.

The previous prime is 21012333371. The next prime is 21012333451. The reversal of 21012333401 is 10433321012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12507067225 + 8505266176 = 111835^2 + 92224^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012333401 - 2¹⁰ = 21012332377 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012333451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506166700 + 10506166701.

It is an arithmetic number, because the mean of its divisors is an integer number (10506166701).

Almost surely, 2^21012333401 is an apocalyptic number.

It is an amenable number.

21012333401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012333401 is an equidigital number, since it uses as much as digits as its factorization.

21012333401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21012333401 its reverse (10433321012), we get a palindrome (31445654413).

The spelling of 21012333401 in words is "twenty-one billion, twelve million, three hundred thirty-three thousand, four hundred one".