1240220421 has 96 divisors (see below), whose sum is σ = 2174515200. Its totient is φ = 672312960.

The previous prime is 1240220413. The next prime is 1240220437.

1240220421 is a `hidden beast` number, since 1 + 24 + 0 + 220 + 421 = 666.

1240220421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1240220421 - 2³ = 1240220413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1240220394 and 1240220403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240220621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4715536 + ... + 4715798.

It is an arithmetic number, because the mean of its divisors is an integer number (22651200).

Almost surely, 2^1240220421 is an apocalyptic number.

1240220421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1240220421 is a deficient number, since it is larger than the sum of its proper divisors (934294779).

1240220421 is a wasteful number, since it uses less digits than its factorization.

1240220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1240220421 is about 35216.7633521310. The cubic root of 1240220421 is about 1074.4007248657.

It can be divided in two parts, 12402 and 20421, that added together give a palindrome (32823).

The spelling of 1240220421 in words is "one billion, two hundred forty million, two hundred twenty thousand, four hundred twenty-one".