21111000210000 has 150 divisors (see below), whose sum is σ = 73828217415810. Its totient is φ = 5629600032000.

The previous prime is 21111000209977. The next prime is 21111000210019. The reversal of 21111000210000 is 1200011112.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 1973980040256 + 19137020169744 = 1404984^2 + 4374588^2 .

It is a tau number, because it is divible by the number of its divisors (150).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 117193335 + ... + 117373334.

Almost surely, 2^{21111000210000} is an apocalyptic number.

21111000210000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111000210000 is an abundant number, since it is smaller than the sum of its proper divisors (52717217205810).

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

21111000210000 is a wasteful number, since it uses less digits than its factorization.

21111000210000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234566703 (or 234566679 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21111000210000 its reverse (1200011112), we get a palindrome (21112200221112).

The spelling of 21111000210000 in words is "twenty-one trillion, one hundred eleven billion, two hundred ten thousand".