21161520122202 has 120 divisors (see below), whose sum is σ = 53021916066240. Its totient is φ = 6289491784320.

The previous prime is 21161520122167. The next prime is 21161520122203. The reversal of 21161520122202 is 20222102516112.

21161520122202 is a `hidden beast` number, since 2 + 1 + 1 + 615 + 2 + 0 + 1 + 22 + 20 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21161520122203) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 11005074 + ... + 12784157.

It is an arithmetic number, because the mean of its divisors is an integer number (441849300552).

Almost surely, 2^{21161520122202} is an apocalyptic number.

21161520122202 is an abundant number, since it is smaller than the sum of its proper divisors (31860395944038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21161520122202 is a wasteful number, since it uses less digits than its factorization.

21161520122202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23789298 (or 23789272 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 21161520122202 its reverse (20222102516112), we get a palindrome (41383622638314).

The spelling of 21161520122202 in words is "twenty-one trillion, one hundred sixty-one billion, five hundred twenty million, one hundred twenty-two thousand, two hundred two".