21199968435 has 16 divisors (see below), whose sum is σ = 34048929024. Its totient is φ = 11263656672.

The previous prime is 21199968421. The next prime is 21199968443. The reversal of 21199968435 is 53486999112.

It is not a de Polignac number, because 21199968435 - 2²⁷ = 21065750707 is a prime.

It is a super-3 number, since 3×21199968435³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2682997 + ... + 2690886.

It is an arithmetic number, because the mean of its divisors is an integer number (2128058064).

Almost surely, 2^21199968435 is an apocalyptic number.

21199968435 is a deficient number, since it is larger than the sum of its proper divisors (12848960589).

21199968435 is a wasteful number, since it uses less digits than its factorization.

21199968435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5374154.

The product of its digits is 4199040, while the sum is 57.

The spelling of 21199968435 in words is "twenty-one billion, one hundred ninety-nine million, nine hundred sixty-eight thousand, four hundred thirty-five".