21523140201 has 16 divisors (see below), whose sum is σ = 29362544064. Its totient is φ = 14019922944.

The previous prime is 21523140187. The next prime is 21523140229. The reversal of 21523140201 is 10204132512.

It is not a de Polignac number, because 21523140201 - 2⁷ = 21523140073 is a prime.

It is a super-2 number, since 2×21523140201² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21523141201) 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, 435816 + ... + 482681.

It is an arithmetic number, because the mean of its divisors is an integer number (1835159004).

Almost surely, 2^21523140201 is an apocalyptic number.

It is an amenable number.

21523140201 is a deficient number, since it is larger than the sum of its proper divisors (7839403863).

21523140201 is a wasteful number, since it uses less digits than its factorization.

21523140201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918680.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21523140201 its reverse (10204132512), we get a palindrome (31727272713).

The spelling of 21523140201 in words is "twenty-one billion, five hundred twenty-three million, one hundred forty thousand, two hundred one".