21964226887 has 4 divisors (see below), whose sum is σ = 21965182600. Its totient is φ = 21963271176.

The previous prime is 21964226821. The next prime is 21964226923. The reversal of 21964226887 is 78862246912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21964226887 - 2¹¹ = 21964224839 is a prime.

It is a super-2 number, since 2×21964226887² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21964236887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442512 + ... + 489637.

It is an arithmetic number, because the mean of its divisors is an integer number (5491295650).

Almost surely, 2^21964226887 is an apocalyptic number.

21964226887 is a deficient number, since it is larger than the sum of its proper divisors (955713).

21964226887 is an equidigital number, since it uses as much as digits as its factorization.

21964226887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955712.

The product of its digits is 4644864, while the sum is 55.

The spelling of 21964226887 in words is "twenty-one billion, nine hundred sixty-four million, two hundred twenty-six thousand, eight hundred eighty-seven".