1240352421 has 16 divisors (see below), whose sum is σ = 2061884928. Its totient is φ = 644338800.

The previous prime is 1240352413. The next prime is 1240352423. The reversal of 1240352421 is 1242530421.

It is not a de Polignac number, because 1240352421 - 2³ = 1240352413 is a prime.

It is a super-2 number, since 2×1240352421² = 3076948256561122482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1240352391 and 1240352400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240352423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2684515 + ... + 2684976.

It is an arithmetic number, because the mean of its divisors is an integer number (128867808).

Almost surely, 2^1240352421 is an apocalyptic number.

1240352421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1240352421 is a deficient number, since it is larger than the sum of its proper divisors (821532507).

1240352421 is a wasteful number, since it uses less digits than its factorization.

1240352421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5369512.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1240352421 is about 35218.6374097579. The cubic root of 1240352421 is about 1074.4388406345.

Adding to 1240352421 its reverse (1242530421), we get a palindrome (2482882842).

The spelling of 1240352421 in words is "one billion, two hundred forty million, three hundred fifty-two thousand, four hundred twenty-one".