1421420021 has 8 divisors (see below), whose sum is σ = 1664101824. Its totient is φ = 1188643680.

The previous prime is 1421419981. The next prime is 1421420027. The reversal of 1421420021 is 1200241241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1421420021 - 2²² = 1417225717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421420027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2476055 + ... + 2476628.

It is an arithmetic number, because the mean of its divisors is an integer number (208012728).

Almost surely, 2^1421420021 is an apocalyptic number.

It is an amenable number.

1421420021 is a deficient number, since it is larger than the sum of its proper divisors (242681803).

1421420021 is an equidigital number, since it uses as much as digits as its factorization.

1421420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4952731.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1421420021 is about 37701.7243770096. The cubic root of 1421420021 is about 1124.3654089543.

Adding to 1421420021 its reverse (1200241241), we get a palindrome (2621661262).

The spelling of 1421420021 in words is "one billion, four hundred twenty-one million, four hundred twenty thousand, twenty-one".