21220101212123 has 32 divisors (see below), whose sum is σ = 24671187360000. Its totient is φ = 18048476920320.

The previous prime is 21220101212081. The next prime is 21220101212173. The reversal of 21220101212123 is 32121210102212.

It is not a de Polignac number, because 21220101212123 - 2⁶ = 21220101212059 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220101212095 and 21220101212104.

It is not an unprimeable number, because it can be changed into a prime (21220101212173) 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, 14693303 + ... + 16072751.

It is an arithmetic number, because the mean of its divisors is an integer number (770974605000).

Almost surely, 2^{21220101212123} is an apocalyptic number.

21220101212123 is a deficient number, since it is larger than the sum of its proper divisors (3451086147877).

21220101212123 is a wasteful number, since it uses less digits than its factorization.

21220101212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380395.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21220101212123 its reverse (32121210102212), we get a palindrome (53341311314335).

The spelling of 21220101212123 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, two hundred twelve thousand, one hundred twenty-three".