2155421425 has 12 divisors (see below), whose sum is σ = 2788928640. Its totient is φ = 1649365520.

The previous prime is 2155421419. The next prime is 2155421467. The reversal of 2155421425 is 5241245512.

It is not a de Polignac number, because 2155421425 - 2³ = 2155421417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1873705 + ... + 1874854.

It is an arithmetic number, because the mean of its divisors is an integer number (232410720).

Almost surely, 2^2155421425 is an apocalyptic number.

2155421425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2155421425 is a deficient number, since it is larger than the sum of its proper divisors (633507215).

2155421425 is a wasteful number, since it uses less digits than its factorization.

2155421425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3748592 (or 3748587 counting only the distinct ones).

The product of its digits is 16000, while the sum is 31.

The square root of 2155421425 is about 46426.5163995749. The cubic root of 2155421425 is about 1291.7468122776.

Adding to 2155421425 its reverse (5241245512), we get a palindrome (7396666937).

The spelling of 2155421425 in words is "two billion, one hundred fifty-five million, four hundred twenty-one thousand, four hundred twenty-five".