1421553399 has 32 divisors (see below), whose sum is σ = 2215987200. Its totient is φ = 793696512.

The previous prime is 1421553361. The next prime is 1421553437. The reversal of 1421553399 is 9933551241.

It is an interprime number because it is at equal distance from previous prime (1421553361) and next prime (1421553437).

It is not a de Polignac number, because 1421553399 - 2¹² = 1421549303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1421553399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421553319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1034677 + ... + 1036049.

It is an arithmetic number, because the mean of its divisors is an integer number (69249600).

Almost surely, 2^1421553399 is an apocalyptic number.

1421553399 is a deficient number, since it is larger than the sum of its proper divisors (794433801).

1421553399 is a wasteful number, since it uses less digits than its factorization.

1421553399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479.

The product of its digits is 145800, while the sum is 42.

The square root of 1421553399 is about 37703.4931936021. The cubic root of 1421553399 is about 1124.4005758806.

The spelling of 1421553399 in words is "one billion, four hundred twenty-one million, five hundred fifty-three thousand, three hundred ninety-nine".