21155211311626 has 8 divisors (see below), whose sum is σ = 36266076534240. Its totient is φ = 9066519133548.

The previous prime is 21155211311609. The next prime is 21155211311693. The reversal of 21155211311626 is 62611311255112.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755543261116 + ... + 755543261143.

It is an arithmetic number, because the mean of its divisors is an integer number (4533259566780).

Almost surely, 2^{21155211311626} is an apocalyptic number.

21155211311626 is a deficient number, since it is larger than the sum of its proper divisors (15110865222614).

21155211311626 is a wasteful number, since it uses less digits than its factorization.

21155211311626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511086522268.

The product of its digits is 21600, while the sum is 37.

Adding to 21155211311626 its reverse (62611311255112), we get a palindrome (83766522566738).

The spelling of 21155211311626 in words is "twenty-one trillion, one hundred fifty-five billion, two hundred eleven million, three hundred eleven thousand, six hundred twenty-six".