21054037 has 2 divisors, whose sum is σ = 21054038. Its totient is φ = 21054036.

The previous prime is 21054017. The next prime is 21054049. The reversal of 21054037 is 73045012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17089956 + 3964081 = 4134^2 + 1991^2 .

It is a cyclic number.

It is not a de Polignac number, because 21054037 - 2⁷ = 21053909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21053999 and 21054017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21054017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527018 + 10527019.

It is an arithmetic number, because the mean of its divisors is an integer number (10527019).

Almost surely, 2^21054037 is an apocalyptic number.

It is an amenable number.

21054037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054037 is an equidigital number, since it uses as much as digits as its factorization.

21054037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21054037 is about 4588.4678270638. The cubic root of 21054037 is about 276.1288562006.

Adding to 21054037 its reverse (73045012), we get a palindrome (94099049).

The spelling of 21054037 in words is "twenty-one million, fifty-four thousand, thirty-seven".