21201035231 has 8 divisors (see below), whose sum is σ = 21442786560. Its totient is φ = 20959362688.

The previous prime is 21201035137. The next prime is 21201035287. The reversal of 21201035231 is 13253010212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21201035231 - 2¹⁰ = 21201034207 is a prime.

It is a super-2 number, since 2×21201035231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201035831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650435 + ... + 682251.

It is an arithmetic number, because the mean of its divisors is an integer number (2680348320).

Almost surely, 2^21201035231 is an apocalyptic number.

21201035231 is a deficient number, since it is larger than the sum of its proper divisors (241751329).

21201035231 is an equidigital number, since it uses as much as digits as its factorization.

21201035231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39393.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21201035231 its reverse (13253010212), we get a palindrome (34454045443).

The spelling of 21201035231 in words is "twenty-one billion, two hundred one million, thirty-five thousand, two hundred thirty-one".