1401421421 has 2 divisors, whose sum is σ = 1401421422. Its totient is φ = 1401421420.

The previous prime is 1401421397. The next prime is 1401421447. The reversal of 1401421421 is 1241241041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1124864521 + 276556900 = 33539^2 + 16630^2 .

It is an emirp because it is prime and its reverse (1241241041) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1401421421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1401421393 and 1401421402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1401421121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700710710 + 700710711.

It is an arithmetic number, because the mean of its divisors is an integer number (700710711).

Almost surely, 2^1401421421 is an apocalyptic number.

It is an amenable number.

1401421421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401421421 is an equidigital number, since it uses as much as digits as its factorization.

1401421421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 1401421421 is about 37435.5635859806. The cubic root of 1401421421 is about 1119.0674159160.

Adding to 1401421421 its reverse (1241241041), we get a palindrome (2642662462).

The spelling of 1401421421 in words is "one billion, four hundred one million, four hundred twenty-one thousand, four hundred twenty-one".