420400121025221 has 16 divisors (see below), whose sum is σ = 423489121267968. Its totient is φ = 417317967427200.

The previous prime is 420400121025191. The next prime is 420400121025257. The reversal of 420400121025221 is 122520121004024.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420400121025221 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 (420400121025281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4919622131 + ... + 4919707583.

It is an arithmetic number, because the mean of its divisors is an integer number (26468070079248).

Almost surely, 2^{420400121025221} is an apocalyptic number.

It is an amenable number.

420400121025221 is a deficient number, since it is larger than the sum of its proper divisors (3089000242747).

420400121025221 is a wasteful number, since it uses less digits than its factorization.

420400121025221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125092.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 420400121025221 its reverse (122520121004024), we get a palindrome (542920242029245).

The spelling of 420400121025221 in words is "four hundred twenty trillion, four hundred billion, one hundred twenty-one million, twenty-five thousand, two hundred twenty-one".