21122001146 has 4 divisors (see below), whose sum is σ = 31683001722. Its totient is φ = 10561000572.

The previous prime is 21122001139. The next prime is 21122001151. The reversal of 21122001146 is 64110022112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14226525625 + 6895475521 = 119275^2 + 83039^2 .

It is a super-2 number, since 2×21122001146² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5280500285 + ... + 5280500288.

Almost surely, 2^21122001146 is an apocalyptic number.

21122001146 is a deficient number, since it is larger than the sum of its proper divisors (10561000576).

21122001146 is a wasteful number, since it uses less digits than its factorization.

21122001146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561000575.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21122001146 its reverse (64110022112), we get a palindrome (85232023258).

The spelling of 21122001146 in words is "twenty-one billion, one hundred twenty-two million, one thousand, one hundred forty-six".