21735037 has 2 divisors, whose sum is σ = 21735038. Its totient is φ = 21735036.

The previous prime is 21735029. The next prime is 21735053. The reversal of 21735037 is 73053712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14584761 + 7150276 = 3819^2 + 2674^2 .

It is a cyclic number.

It is not a de Polignac number, because 21735037 - 2³ = 21735029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21734996 and 21735014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21735137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10867518 + 10867519.

It is an arithmetic number, because the mean of its divisors is an integer number (10867519).

Almost surely, 2^21735037 is an apocalyptic number.

It is an amenable number.

21735037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21735037 is an equidigital number, since it uses as much as digits as its factorization.

21735037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 21735037 is about 4662.0850485593. The cubic root of 21735037 is about 279.0744824117.

Adding to 21735037 its reverse (73053712), we get a palindrome (94788749).

The spelling of 21735037 in words is "twenty-one million, seven hundred thirty-five thousand, thirty-seven".