21435140461 has 8 divisors (see below), whose sum is σ = 24498253440. Its totient is φ = 18372265008.

The previous prime is 21435140437. The next prime is 21435140471. The reversal of 21435140461 is 16404153412.

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 21435140461 - 2⁵ = 21435140429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435140471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224475 + ... + 305383.

It is an arithmetic number, because the mean of its divisors is an integer number (3062281680).

Almost surely, 2^21435140461 is an apocalyptic number.

It is an amenable number.

21435140461 is a deficient number, since it is larger than the sum of its proper divisors (3063112979).

21435140461 is an equidigital number, since it uses as much as digits as its factorization.

21435140461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118763.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 21435140461 its reverse (16404153412), we get a palindrome (37839293873).

The spelling of 21435140461 in words is "twenty-one billion, four hundred thirty-five million, one hundred forty thousand, four hundred sixty-one".