21011023201 has 16 divisors (see below), whose sum is σ = 24328675840. Its totient is φ = 17772618240.

The previous prime is 21011023133. The next prime is 21011023211. The reversal of 21011023201 is 10232011012.

It is a cyclic number.

It is not a de Polignac number, because 21011023201 - 2³³ = 12421088609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011023211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1253065 + ... + 1269721.

It is an arithmetic number, because the mean of its divisors is an integer number (1520542240).

Almost surely, 2^21011023201 is an apocalyptic number.

It is an amenable number.

21011023201 is a deficient number, since it is larger than the sum of its proper divisors (3317652639).

21011023201 is a wasteful number, since it uses less digits than its factorization.

21011023201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19024.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21011023201 its reverse (10232011012), we get a palindrome (31243034213).

The spelling of 21011023201 in words is "twenty-one billion, eleven million, twenty-three thousand, two hundred one".