21002341155 has 32 divisors (see below), whose sum is σ = 33903525888. Its totient is φ = 11101507200.

The previous prime is 21002341133. The next prime is 21002341189. The reversal of 21002341155 is 55114320012.

It is a happy number.

It is not a de Polignac number, because 21002341155 - 2⁵ = 21002341123 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2016010 + ... + 2026400.

It is an arithmetic number, because the mean of its divisors is an integer number (1059485184).

Almost surely, 2^21002341155 is an apocalyptic number.

21002341155 is a deficient number, since it is larger than the sum of its proper divisors (12901184733).

21002341155 is a wasteful number, since it uses less digits than its factorization.

21002341155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11587.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21002341155 its reverse (55114320012), we get a palindrome (76116661167).

The spelling of 21002341155 in words is "twenty-one billion, two million, three hundred forty-one thousand, one hundred fifty-five".