21050301155 has 24 divisors (see below), whose sum is σ = 28542220128. Its totient is φ = 14868961536.

The previous prime is 21050301091. The next prime is 21050301157. The reversal of 21050301155 is 55110305012.

It is a happy number.

It is not a de Polignac number, because 21050301155 - 2⁶ = 21050301091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21050301155.

It is not an unprimeable number, because it can be changed into a prime (21050301157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 522122 + ... + 560991.

It is an arithmetic number, because the mean of its divisors is an integer number (1189259172).

Almost surely, 2^21050301155 is an apocalyptic number.

21050301155 is a deficient number, since it is larger than the sum of its proper divisors (7491918973).

21050301155 is a wasteful number, since it uses less digits than its factorization.

21050301155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083167 (or 1083154 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 23.

Adding to 21050301155 its reverse (55110305012), we get a palindrome (76160606167).

The spelling of 21050301155 in words is "twenty-one billion, fifty million, three hundred one thousand, one hundred fifty-five".