21111010210202 has 24 divisors (see below), whose sum is σ = 35028696848628. Its totient is φ = 9534793245120.

The previous prime is 21111010210183. The next prime is 21111010210259. The reversal of 21111010210202 is 20201201011112.

It can be written as a sum of positive squares in 2 ways, for example, as 20962030421761 + 148979788441 = 4578431^2 + 385979^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277782323 + ... + 277858310.

Almost surely, 2^{21111010210202} is an apocalyptic number.

21111010210202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21111010210202 is a deficient number, since it is larger than the sum of its proper divisors (13917686638426).

21111010210202 is a wasteful number, since it uses less digits than its factorization.

21111010210202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555640814 (or 555640803 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111010210202 its reverse (20201201011112), we get a palindrome (41312211221314).

The spelling of 21111010210202 in words is "twenty-one trillion, one hundred eleven billion, ten million, two hundred ten thousand, two hundred two".