1421521240 has 16 divisors (see below), whose sum is σ = 3198422880. Its totient is φ = 568608480.

The previous prime is 1421521237. The next prime is 1421521243. The reversal of 1421521240 is 421251241.

It is an interprime number because it is at equal distance from previous prime (1421521237) and next prime (1421521243).

It is a super-2 number, since 2×1421521240² = 4041445271542275200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421521243) 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, 17768976 + ... + 17769055.

It is an arithmetic number, because the mean of its divisors is an integer number (199901430).

Almost surely, 2^1421521240 is an apocalyptic number.

1421521240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421521240 is an abundant number, since it is smaller than the sum of its proper divisors (1776901640).

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

1421521240 is a wasteful number, since it uses less digits than its factorization.

1421521240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35538042 (or 35538038 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1421521240 is about 37703.0667187697. The cubic root of 1421521240 is about 1124.3920969235.

Adding to 1421521240 its reverse (421251241), we get a palindrome (1842772481).

The spelling of 1421521240 in words is "one billion, four hundred twenty-one million, five hundred twenty-one thousand, two hundred forty".