21010232437 has 2 divisors, whose sum is σ = 21010232438. Its totient is φ = 21010232436.

The previous prime is 21010232401. The next prime is 21010232479. The reversal of 21010232437 is 73423201012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19418701201 + 1591531236 = 139351^2 + 39894^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010232437 - 2¹¹ = 21010230389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010532437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505116218 + 10505116219.

It is an arithmetic number, because the mean of its divisors is an integer number (10505116219).

Almost surely, 2^21010232437 is an apocalyptic number.

It is an amenable number.

21010232437 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010232437 is an equidigital number, since it uses as much as digits as its factorization.

21010232437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 21010232437 its reverse (73423201012), we get a palindrome (94433433449).

The spelling of 21010232437 in words is "twenty-one billion, ten million, two hundred thirty-two thousand, four hundred thirty-seven".