21111010010121 has 16 divisors (see below), whose sum is σ = 28229593392000. Its totient is φ = 14033219299968.

The previous prime is 21111010010089. The next prime is 21111010010137. The reversal of 21111010010121 is 12101001011112.

It is not a de Polignac number, because 21111010010121 - 2⁵ = 21111010010089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111010010097 and 21111010010106.

It is not an unprimeable number, because it can be changed into a prime (21111010010161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33198460 + ... + 33828386.

It is an arithmetic number, because the mean of its divisors is an integer number (1764349587000).

Almost surely, 2^{21111010010121} is an apocalyptic number.

It is an amenable number.

21111010010121 is a deficient number, since it is larger than the sum of its proper divisors (7118583381879).

21111010010121 is a wasteful number, since it uses less digits than its factorization.

21111010010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662288.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21111010010121 its reverse (12101001011112), we get a palindrome (33212011021233).

The spelling of 21111010010121 in words is "twenty-one trillion, one hundred eleven billion, ten million, ten thousand, one hundred twenty-one".