20021221112123 has 48 divisors (see below), whose sum is σ = 25848867495168. Its totient is φ = 15330288456000.

The previous prime is 20021221112089. The next prime is 20021221112131. The reversal of 20021221112123 is 32121112212002.

It is not a de Polignac number, because 20021221112123 - 2⁴² = 15623174601019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021221112095 and 20021221112104.

It is not an unprimeable number, because it can be changed into a prime (20021221114123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33602936 + ... + 34193562.

It is an arithmetic number, because the mean of its divisors is an integer number (538518072816).

Almost surely, 2^{20021221112123} is an apocalyptic number.

20021221112123 is a deficient number, since it is larger than the sum of its proper divisors (5827646383045).

20021221112123 is a wasteful number, since it uses less digits than its factorization.

20021221112123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591744 (or 591737 counting only the distinct ones).

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

Adding to 20021221112123 its reverse (32121112212002), we get a palindrome (52142333324125).

The spelling of 20021221112123 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, one hundred twenty-three".