21055153606 has 8 divisors (see below), whose sum is σ = 31588167960. Its totient is φ = 10525764288.

The previous prime is 21055153517. The next prime is 21055153607. The reversal of 21055153606 is 60635155012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21055153607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 891691 + ... + 914998.

It is an arithmetic number, because the mean of its divisors is an integer number (3948520995).

Almost surely, 2^21055153606 is an apocalyptic number.

21055153606 is a deficient number, since it is larger than the sum of its proper divisors (10533014354).

21055153606 is a wasteful number, since it uses less digits than its factorization.

21055153606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812518.

The product of its (nonzero) digits is 27000, while the sum is 34.

The spelling of 21055153606 in words is "twenty-one billion, fifty-five million, one hundred fifty-three thousand, six hundred six".