21112121010101 has 16 divisors (see below), whose sum is σ = 24033223905408. Its totient is φ = 18358019486400.

The previous prime is 21112121010067. The next prime is 21112121010107. The reversal of 21112121010101 is 10101012121112.

It is not a de Polignac number, because 21112121010101 - 2¹⁸ = 21112120747957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112121010107) 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, 13123571 + ... + 14644191.

It is an arithmetic number, because the mean of its divisors is an integer number (1502076494088).

Almost surely, 2^{21112121010101} is an apocalyptic number.

It is an amenable number.

21112121010101 is a deficient number, since it is larger than the sum of its proper divisors (2921102895307).

21112121010101 is a wasteful number, since it uses less digits than its factorization.

21112121010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575532.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21112121010101 its reverse (10101012121112), we get a palindrome (31213133131213).

The spelling of 21112121010101 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-one million, ten thousand, one hundred one".