1420637021 has 4 divisors (see below), whose sum is σ = 1482403872. Its totient is φ = 1358870172.

The previous prime is 1420636961. The next prime is 1420637027. The reversal of 1420637021 is 1207360241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1420637021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420637027) 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 3 ways as a sum of consecutive naturals, for example, 30883391 + ... + 30883436.

It is an arithmetic number, because the mean of its divisors is an integer number (370600968).

Almost surely, 2^1420637021 is an apocalyptic number.

It is an amenable number.

1420637021 is a deficient number, since it is larger than the sum of its proper divisors (61766851).

1420637021 is an equidigital number, since it uses as much as digits as its factorization.

1420637021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61766850.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1420637021 is about 37691.3388061501. The cubic root of 1420637021 is about 1124.1589159623.

Adding to 1420637021 its reverse (1207360241), we get a palindrome (2627997262).

The spelling of 1420637021 in words is "one billion, four hundred twenty million, six hundred thirty-seven thousand, twenty-one".