21435142075 has 6 divisors (see below), whose sum is σ = 26579576204. Its totient is φ = 17148113640.

The previous prime is 21435142021. The next prime is 21435142103. The reversal of 21435142075 is 57024153412.

It is not a de Polignac number, because 21435142075 - 2²¹ = 21433044923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21435142075.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 428702817 + ... + 428702866.

Almost surely, 2^21435142075 is an apocalyptic number.

21435142075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21435142075 is a deficient number, since it is larger than the sum of its proper divisors (5144434129).

21435142075 is an equidigital number, since it uses as much as digits as its factorization.

21435142075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857405693 (or 857405688 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

Adding to 21435142075 its reverse (57024153412), we get a palindrome (78459295487).

The spelling of 21435142075 in words is "twenty-one billion, four hundred thirty-five million, one hundred forty-two thousand, seventy-five".