21231431035 has 8 divisors (see below), whose sum is σ = 25481451600. Its totient is φ = 16982655264.

The previous prime is 21231431029. The next prime is 21231431069. The reversal of 21231431035 is 53013413212.

It is a happy number.

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 21231431035 - 2³ = 21231431027 is a prime.

It is a super-2 number, since 2×21231431035² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273252 + ... + 342241.

It is an arithmetic number, because the mean of its divisors is an integer number (3185181450).

Almost surely, 2^21231431035 is an apocalyptic number.

21231431035 is a deficient number, since it is larger than the sum of its proper divisors (4250020565).

21231431035 is an equidigital number, since it uses as much as digits as its factorization.

21231431035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622397.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21231431035 its reverse (53013413212), we get a palindrome (74244844247).

The spelling of 21231431035 in words is "twenty-one billion, two hundred thirty-one million, four hundred thirty-one thousand, thirty-five".