21212122220113 has 16 divisors (see below), whose sum is σ = 23210988091200. Its totient is φ = 19225013875200.

The previous prime is 21212122220101. The next prime is 21212122220123. The reversal of 21212122220113 is 31102222121212.

It is a cyclic number.

It is not a de Polignac number, because 21212122220113 - 2²⁵ = 21212088665681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212122220123) 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, 48339573 + ... + 48776413.

It is an arithmetic number, because the mean of its divisors is an integer number (1450686755700).

Almost surely, 2^{21212122220113} is an apocalyptic number.

It is an amenable number.

21212122220113 is a deficient number, since it is larger than the sum of its proper divisors (1998865871087).

21212122220113 is a wasteful number, since it uses less digits than its factorization.

21212122220113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450288.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21212122220113 its reverse (31102222121212), we get a palindrome (52314344341325).

The spelling of 21212122220113 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred twenty thousand, one hundred thirteen".