20121204040421 has 8 divisors (see below), whose sum is σ = 21953084325888. Its totient is φ = 18289770408000.

The previous prime is 20121204040397. The next prime is 20121204040447. The reversal of 20121204040421 is 12404040212102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121204040421 - 2²² = 20121199846117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121204060421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111569060 + ... + 111749261.

It is an arithmetic number, because the mean of its divisors is an integer number (2744135540736).

Almost surely, 2^{20121204040421} is an apocalyptic number.

It is an amenable number.

20121204040421 is a deficient number, since it is larger than the sum of its proper divisors (1831880285467).

20121204040421 is a wasteful number, since it uses less digits than its factorization.

20121204040421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223326523.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 20121204040421 its reverse (12404040212102), we get a palindrome (32525244252523).

The spelling of 20121204040421 in words is "twenty trillion, one hundred twenty-one billion, two hundred four million, forty thousand, four hundred twenty-one".