21120001020111 has 32 divisors (see below), whose sum is σ = 34111951649280. Its totient is φ = 11346661472256.

The previous prime is 21120001020089. The next prime is 21120001020127. The reversal of 21120001020111 is 11102010002112.

It is not a de Polignac number, because 21120001020111 - 2¹⁰ = 21120001019087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120001120111) 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, 30897226 + ... + 31573383.

It is an arithmetic number, because the mean of its divisors is an integer number (1065998489040).

Almost surely, 2^{21120001020111} is an apocalyptic number.

21120001020111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21120001020111 is a deficient number, since it is larger than the sum of its proper divisors (12991950629169).

21120001020111 is a wasteful number, since it uses less digits than its factorization.

21120001020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62471583.

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

Adding to 21120001020111 its reverse (11102010002112), we get a palindrome (32222011022223).

The spelling of 21120001020111 in words is "twenty-one trillion, one hundred twenty billion, one million, twenty thousand, one hundred eleven".