21969891435 has 16 divisors (see below), whose sum is σ = 37219581216. Its totient is φ = 11028023808.

The previous prime is 21969891407. The next prime is 21969891439. The reversal of 21969891435 is 53419896912.

It is not a de Polignac number, because 21969891435 - 2⁵ = 21969891403 is a prime.

It is a super-3 number, since 3×21969891435³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21969891439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43077964 + ... + 43078473.

It is an arithmetic number, because the mean of its divisors is an integer number (2326223826).

Almost surely, 2^21969891435 is an apocalyptic number.

21969891435 is a deficient number, since it is larger than the sum of its proper divisors (15249689781).

21969891435 is a wasteful number, since it uses less digits than its factorization.

21969891435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86156462.

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

The spelling of 21969891435 in words is "twenty-one billion, nine hundred sixty-nine million, eight hundred ninety-one thousand, four hundred thirty-five".