21012221121102 has 12 divisors (see below), whose sum is σ = 45526479095760. Its totient is φ = 7004073707028.

The previous prime is 21012221121061. The next prime is 21012221121107. The reversal of 21012221121102 is 20112112221012.

21012221121102 is a `hidden beast` number, since 210 + 12 + 221 + 121 + 102 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1167345617839 = 21012221121102 / (2 + 1 + 0 + 1 + 2 + 2 + 2 + 1 + 1 + 2 + 1 + 1 + 0 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012221121107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 583672808902 + ... + 583672808937.

It is an arithmetic number, because the mean of its divisors is an integer number (3793873257980).

Almost surely, 2^{21012221121102} is an apocalyptic number.

21012221121102 is an abundant number, since it is smaller than the sum of its proper divisors (24514257974658).

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

21012221121102 is a wasteful number, since it uses less digits than its factorization.

21012221121102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167345617847 (or 1167345617844 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21012221121102 its reverse (20112112221012), we get a palindrome (41124333342114).

The spelling of 21012221121102 in words is "twenty-one trillion, twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred two".