1421553403 has 4 divisors (see below), whose sum is σ = 1422483448. Its totient is φ = 1420623360.

The previous prime is 1421553361. The next prime is 1421553437. The reversal of 1421553403 is 3043551241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3043551241 = 2339 ⋅1301219.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421553403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421553803) 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, 462726 + ... + 465787.

It is an arithmetic number, because the mean of its divisors is an integer number (355620862).

Almost surely, 2^1421553403 is an apocalyptic number.

1421553403 is a deficient number, since it is larger than the sum of its proper divisors (930045).

1421553403 is an equidigital number, since it uses as much as digits as its factorization.

1421553403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930044.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1421553403 is about 37703.4932466476. The cubic root of 1421553403 is about 1124.4005769352.

The spelling of 1421553403 in words is "one billion, four hundred twenty-one million, five hundred fifty-three thousand, four hundred three".