21111200001210 has 64 divisors (see below), whose sum is σ = 55277885928960. Its totient is φ = 5117410562880.

The previous prime is 21111200001197. The next prime is 21111200001211. The reversal of 21111200001210 is 1210000211112.

It is not an unprimeable number, because it can be changed into a prime (21111200001211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 865161 + ... + 6555219.

It is an arithmetic number, because the mean of its divisors is an integer number (863716967640).

Almost surely, 2^{21111200001210} is an apocalyptic number.

21111200001210 is an abundant number, since it is smaller than the sum of its proper divisors (34166685927750).

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

21111200001210 is a wasteful number, since it uses less digits than its factorization.

21111200001210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5701323.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21111200001210 its reverse (1210000211112), we get a palindrome (22321200212322).

The spelling of 21111200001210 in words is "twenty-one trillion, one hundred eleven billion, two hundred million, one thousand, two hundred ten".