21111120021201 has 32 divisors (see below), whose sum is σ = 32206902624000. Its totient is φ = 12049410078720.

The previous prime is 21111120021163. The next prime is 21111120021289. The reversal of 21111120021201 is 10212002111112.

It is a happy number.

It is not a de Polignac number, because 21111120021201 - 2⁶ = 21111120021137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111120021601) 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, 123849291 + ... + 124019631.

It is an arithmetic number, because the mean of its divisors is an integer number (1006465707000).

Almost surely, 2^{21111120021201} is an apocalyptic number.

21111120021201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21111120021201 is a deficient number, since it is larger than the sum of its proper divisors (11095782602799).

21111120021201 is a wasteful number, since it uses less digits than its factorization.

21111120021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177209.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21111120021201 its reverse (10212002111112), we get a palindrome (31323122132313).

The spelling of 21111120021201 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty million, twenty-one thousand, two hundred one".