1400215021 has 2 divisors, whose sum is σ = 1400215022. Its totient is φ = 1400215020.

The previous prime is 1400215009. The next prime is 1400215043. The reversal of 1400215021 is 1205120041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1103169796 + 297045225 = 33214^2 + 17235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400215021 - 2²³ = 1391826413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1400214986 and 1400215004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1400215001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700107510 + 700107511.

It is an arithmetic number, because the mean of its divisors is an integer number (700107511).

Almost surely, 2^1400215021 is an apocalyptic number.

It is an amenable number.

1400215021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400215021 is an equidigital number, since it uses as much as digits as its factorization.

1400215021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1400215021 is about 37419.4470963963. The cubic root of 1400215021 is about 1118.7462109627.

Adding to 1400215021 its reverse (1205120041), we get a palindrome (2605335062).

The spelling of 1400215021 in words is "one billion, four hundred million, two hundred fifteen thousand, twenty-one".