2420155421 has 4 divisors (see below), whose sum is σ = 2479183644. Its totient is φ = 2361127200.

The previous prime is 2420155363. The next prime is 2420155433. The reversal of 2420155421 is 1245510242.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114811225 + 2305344196 = 10715^2 + 48014^2 .

It is a cyclic number.

It is not a de Polignac number, because 2420155421 - 2¹⁴ = 2420139037 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 (2420155021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29514050 + ... + 29514131.

It is an arithmetic number, because the mean of its divisors is an integer number (619795911).

Almost surely, 2^2420155421 is an apocalyptic number.

It is an amenable number.

2420155421 is a deficient number, since it is larger than the sum of its proper divisors (59028223).

2420155421 is an equidigital number, since it uses as much as digits as its factorization.

2420155421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59028222.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 2420155421 is about 49195.0751701834. The cubic root of 2420155421 is about 1342.6034299413.

Adding to 2420155421 its reverse (1245510242), we get a palindrome (3665665663).

The spelling of 2420155421 in words is "two billion, four hundred twenty million, one hundred fifty-five thousand, four hundred twenty-one".