20123211442 has 8 divisors (see below), whose sum is σ = 30256516332. Its totient is φ = 10037706000.

The previous prime is 20123211439. The next prime is 20123211461. The reversal of 20123211442 is 24411232102.

It can be written as a sum of positive squares in 2 ways, for example, as 15274735281 + 4848476161 = 123591^2 + 69631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×20123211442³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11948809 + ... + 11950492.

Almost surely, 2^20123211442 is an apocalyptic number.

20123211442 is a deficient number, since it is larger than the sum of its proper divisors (10133304890).

20123211442 is a wasteful number, since it uses less digits than its factorization.

20123211442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23899724.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 20123211442 its reverse (24411232102), we get a palindrome (44534443544).

The spelling of 20123211442 in words is "twenty billion, one hundred twenty-three million, two hundred eleven thousand, four hundred forty-two".