1421818236021 has 4 divisors (see below), whose sum is σ = 1895757648032. Its totient is φ = 947878824012.

The previous prime is 1421818235939. The next prime is 1421818236061. The reversal of 1421818236021 is 1206328181241.

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 not a de Polignac number, because 1421818236021 - 2²³ = 1421809847413 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 (1421818236061) 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, 236969706001 + ... + 236969706006.

It is an arithmetic number, because the mean of its divisors is an integer number (473939412008).

Almost surely, 2^{1421818236021} is an apocalyptic number.

It is an amenable number.

1421818236021 is a deficient number, since it is larger than the sum of its proper divisors (473939412011).

1421818236021 is an equidigital number, since it uses as much as digits as its factorization.

1421818236021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473939412010.

The product of its (nonzero) digits is 36864, while the sum is 39.

The spelling of 1421818236021 in words is "one trillion, four hundred twenty-one billion, eight hundred eighteen million, two hundred thirty-six thousand, twenty-one".