21120221210123 has 16 divisors (see below), whose sum is σ = 24155137013184. Its totient is φ = 18089743257600.

The previous prime is 21120221210111. The next prime is 21120221210161. The reversal of 21120221210123 is 32101212202112.

It is not a de Polignac number, because 21120221210123 - 2²² = 21120217015819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120221210095 and 21120221210104.

It is not an unprimeable number, because it can be changed into a prime (21120221210423) 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, 106333661 + ... + 106532097.

It is an arithmetic number, because the mean of its divisors is an integer number (1509696063324).

Almost surely, 2^{21120221210123} is an apocalyptic number.

21120221210123 is a deficient number, since it is larger than the sum of its proper divisors (3034915803061).

21120221210123 is a wasteful number, since it uses less digits than its factorization.

21120221210123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209542.

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

Adding to 21120221210123 its reverse (32101212202112), we get a palindrome (53221433412235).

The spelling of 21120221210123 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-three".