421122440 has 16 divisors (see below), whose sum is σ = 947525580. Its totient is φ = 168448960.

The previous prime is 421122431. The next prime is 421122497. The reversal of 421122440 is 44221124.

It can be written as a sum of positive squares in 2 ways, for example, as 409738564 + 11383876 = 20242^2 + 3374^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5263991 + ... + 5264070.

Almost surely, 2^421122440 is an apocalyptic number.

421122440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421122440 is an abundant number, since it is smaller than the sum of its proper divisors (526403140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421122440 is a wasteful number, since it uses less digits than its factorization.

421122440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10528072 (or 10528068 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 421122440 is about 20521.2679920126. The cubic root of 421122440 is about 749.5537730799.

Adding to 421122440 its reverse (44221124), we get a palindrome (465343564).

It can be divided in two parts, 42112 and 2440, that multiplied together give a triangular number (102753280 = T₁₄₃₃₅).

The spelling of 421122440 in words is "four hundred twenty-one million, one hundred twenty-two thousand, four hundred forty".