4221420557861 has 24 divisors (see below), whose sum is σ = 4752505162944. Its totient is φ = 3744913011840.

The previous prime is 4221420557843. The next prime is 4221420557909. The reversal of 4221420557861 is 1687550241224.

4221420557861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-4221420557861 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 (4221420587861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4082321 + ... + 5010806.

It is an arithmetic number, because the mean of its divisors is an integer number (198021048456).

Almost surely, 2^{4221420557861} is an apocalyptic number.

4221420557861 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4221420557861 is a deficient number, since it is larger than the sum of its proper divisors (531084605083).

4221420557861 is a wasteful number, since it uses less digits than its factorization.

4221420557861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9093261 (or 9093248 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 47.

The spelling of 4221420557861 in words is "four trillion, two hundred twenty-one billion, four hundred twenty million, five hundred fifty-seven thousand, eight hundred sixty-one".