21011122231000 has 64 divisors (see below), whose sum is σ = 53635664777760. Its totient is φ = 7640408080000.

The previous prime is 21011122230979. The next prime is 21011122231003. The reversal of 21011122231000 is 13222111012.

It is a super-2 number, since 2×21011122231000² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011122231003) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 955040011 + ... + 955062010.

Almost surely, 2^{21011122231000} is an apocalyptic number.

21011122231000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011122231000 is an abundant number, since it is smaller than the sum of its proper divisors (32624542546760).

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

21011122231000 is a wasteful number, since it uses less digits than its factorization.

21011122231000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910102053 (or 1910102039 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21011122231000 its reverse (13222111012), we get a palindrome (21024344342012).

The spelling of 21011122231000 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, two hundred thirty-one thousand".