21140214437 has 2 divisors, whose sum is σ = 21140214438. Its totient is φ = 21140214436.

The previous prime is 21140214413. The next prime is 21140214443. The reversal of 21140214437 is 73441204112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20187010561 + 953203876 = 142081^2 + 30874^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140214437 - 2²⁸ = 20871778981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140211437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570107218 + 10570107219.

It is an arithmetic number, because the mean of its divisors is an integer number (10570107219).

Almost surely, 2^21140214437 is an apocalyptic number.

It is an amenable number.

21140214437 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140214437 is an equidigital number, since it uses as much as digits as its factorization.

21140214437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

Adding to 21140214437 its reverse (73441204112), we get a palindrome (94581418549).

The spelling of 21140214437 in words is "twenty-one billion, one hundred forty million, two hundred fourteen thousand, four hundred thirty-seven".