21967449357 has 12 divisors (see below), whose sum is σ = 34071962496. Its totient is φ = 12552828120.

The previous prime is 21967449349. The next prime is 21967449359. The reversal of 21967449357 is 75394476912.

It is a happy number.

It is not a de Polignac number, because 21967449357 - 2³ = 21967449349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21967449297 and 21967449306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21967449359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74719069 + ... + 74719362.

It is an arithmetic number, because the mean of its divisors is an integer number (2839330208).

Almost surely, 2^21967449357 is an apocalyptic number.

It is an amenable number.

21967449357 is a deficient number, since it is larger than the sum of its proper divisors (12104513139).

21967449357 is a wasteful number, since it uses less digits than its factorization.

21967449357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149438448 (or 149438441 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 57.

The spelling of 21967449357 in words is "twenty-one billion, nine hundred sixty-seven million, four hundred forty-nine thousand, three hundred fifty-seven".