21407919464 has 16 divisors (see below), whose sum is σ = 40141701600. Its totient is φ = 10703465712.

The previous prime is 21407919437. The next prime is 21407919521. The reversal of 21407919464 is 46491970412.

It is a happy number.

It is a super-2 number, since 2×21407919464² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 176477 + ... + 271955.

It is an arithmetic number, because the mean of its divisors is an integer number (2508856350).

Almost surely, 2^21407919464 is an apocalyptic number.

It is an amenable number.

21407919464 is a deficient number, since it is larger than the sum of its proper divisors (18733782136).

21407919464 is a wasteful number, since it uses less digits than its factorization.

21407919464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123512 (or 123508 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 21407919464 in words is "twenty-one billion, four hundred seven million, nine hundred nineteen thousand, four hundred sixty-four".