1421554021 has 2 divisors, whose sum is σ = 1421554022. Its totient is φ = 1421554020.

The previous prime is 1421554007. The next prime is 1421554049. The reversal of 1421554021 is 1204551241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1141493796 + 280060225 = 33786^2 + 16735^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421554021 - 2¹¹ = 1421551973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421554061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710777010 + 710777011.

It is an arithmetic number, because the mean of its divisors is an integer number (710777011).

Almost surely, 2^1421554021 is an apocalyptic number.

It is an amenable number.

1421554021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421554021 is an equidigital number, since it uses as much as digits as its factorization.

1421554021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1421554021 is about 37703.5014421738. The cubic root of 1421554021 is about 1124.4007398742.

The spelling of 1421554021 in words is "one billion, four hundred twenty-one million, five hundred fifty-four thousand, twenty-one".