21123120022 has 4 divisors (see below), whose sum is σ = 31684680036. Its totient is φ = 10561560010.

The previous prime is 21123120019. The next prime is 21123120023. The reversal of 21123120022 is 22002132112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×21123120022³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21123119978 and 21123120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123120023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280780004 + ... + 5280780007.

It is an arithmetic number, because the mean of its divisors is an integer number (7921170009).

Almost surely, 2^21123120022 is an apocalyptic number.

21123120022 is a deficient number, since it is larger than the sum of its proper divisors (10561560014).

21123120022 is a wasteful number, since it uses less digits than its factorization.

21123120022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561560013.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21123120022 its reverse (22002132112), we get a palindrome (43125252134).

The spelling of 21123120022 in words is "twenty-one billion, one hundred twenty-three million, one hundred twenty thousand, twenty-two".