21111203122000 has 40 divisors (see below), whose sum is σ = 51046889153832. Its totient is φ = 8444481248000.

The previous prime is 21111203121929. The next prime is 21111203122001. The reversal of 21111203122000 is 22130211112.

It can be written as a sum of positive squares in 4 ways, for example, as 407028688144 + 20704174433856 = 637988^2 + 4550184^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111203122001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5277798781 + ... + 5277802780.

Almost surely, 2^{21111203122000} is an apocalyptic number.

21111203122000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111203122000 is an abundant number, since it is smaller than the sum of its proper divisors (29935686031832).

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

21111203122000 is a wasteful number, since it uses less digits than its factorization.

21111203122000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555601584 (or 10555601568 counting only the distinct ones).

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

Adding to 21111203122000 its reverse (22130211112), we get a palindrome (21133333333112).

The spelling of 21111203122000 in words is "twenty-one trillion, one hundred eleven billion, two hundred three million, one hundred twenty-two thousand".