21641265622 has 4 divisors (see below), whose sum is σ = 32461898436. Its totient is φ = 10820632810.

The previous prime is 21641265599. The next prime is 21641265623. The reversal of 21641265622 is 22656214612.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21641265623) 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 as a sum of consecutive naturals, namely, 5410316404 + ... + 5410316407.

It is an arithmetic number, because the mean of its divisors is an integer number (8115474609).

Almost surely, 2^21641265622 is an apocalyptic number.

21641265622 is a deficient number, since it is larger than the sum of its proper divisors (10820632814).

21641265622 is a wasteful number, since it uses less digits than its factorization.

21641265622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10820632813.

The product of its digits is 69120, while the sum is 37.

The spelling of 21641265622 in words is "twenty-one billion, six hundred forty-one million, two hundred sixty-five thousand, six hundred twenty-two".