421120551 has 4 divisors (see below), whose sum is σ = 561494072. Its totient is φ = 280747032.

The previous prime is 421120489. The next prime is 421120589. The reversal of 421120551 is 155021124.

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

It is not a de Polignac number, because 421120551 - 2⁶ = 421120487 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 (421120451) 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, 70186756 + ... + 70186761.

It is an arithmetic number, because the mean of its divisors is an integer number (140373518).

Almost surely, 2^421120551 is an apocalyptic number.

421120551 is a deficient number, since it is larger than the sum of its proper divisors (140373521).

421120551 is a wasteful number, since it uses less digits than its factorization.

421120551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140373520.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 421120551 is about 20521.2219665399. The cubic root of 421120551 is about 749.5526523376.

Adding to 421120551 its reverse (155021124), we get a palindrome (576141675).

The spelling of 421120551 in words is "four hundred twenty-one million, one hundred twenty thousand, five hundred fifty-one".