21545311622 has 4 divisors (see below), whose sum is σ = 32317967436. Its totient is φ = 10772655810.

The previous prime is 21545311597. The next prime is 21545311661. The reversal of 21545311622 is 22611354512.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5386327904 + ... + 5386327907.

It is an arithmetic number, because the mean of its divisors is an integer number (8079491859).

Almost surely, 2^21545311622 is an apocalyptic number.

21545311622 is a deficient number, since it is larger than the sum of its proper divisors (10772655814).

21545311622 is a wasteful number, since it uses less digits than its factorization.

21545311622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10772655813.

The product of its digits is 14400, while the sum is 32.

The spelling of 21545311622 in words is "twenty-one billion, five hundred forty-five million, three hundred eleven thousand, six hundred twenty-two".