20121253442 has 8 divisors (see below), whose sum is σ = 30211677756. Its totient is φ = 10050694192.

The previous prime is 20121253429. The next prime is 20121253459. The reversal of 20121253442 is 24435212102.

It can be written as a sum of positive squares in 2 ways, for example, as 19982932321 + 138321121 = 141361^2 + 11761^2 .

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

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, 4963733 + ... + 4967784.

Almost surely, 2^20121253442 is an apocalyptic number.

20121253442 is a deficient number, since it is larger than the sum of its proper divisors (10090424314).

20121253442 is a wasteful number, since it uses less digits than its factorization.

20121253442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9932532.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 20121253442 its reverse (24435212102), we get a palindrome (44556465544).

The spelling of 20121253442 in words is "twenty billion, one hundred twenty-one million, two hundred fifty-three thousand, four hundred forty-two".