1421040021 has 4 divisors (see below), whose sum is σ = 1894720032. Its totient is φ = 947360012.

The previous prime is 1421040007. The next prime is 1421040029. The reversal of 1421040021 is 1200401241.

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 not a de Polignac number, because 1421040021 - 2⁵ = 1421039989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421040029) 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, 236840001 + ... + 236840006.

It is an arithmetic number, because the mean of its divisors is an integer number (473680008).

Almost surely, 2^1421040021 is an apocalyptic number.

It is an amenable number.

1421040021 is a deficient number, since it is larger than the sum of its proper divisors (473680011).

1421040021 is an equidigital number, since it uses as much as digits as its factorization.

1421040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473680010.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1421040021 is about 37696.6844828560. The cubic root of 1421040021 is about 1124.2652047152.

Adding to 1421040021 its reverse (1200401241), we get a palindrome (2621441262).

The spelling of 1421040021 in words is "one billion, four hundred twenty-one million, forty thousand, twenty-one".