21060037 has 4 divisors (see below), whose sum is σ = 22168480. Its totient is φ = 19951596.

The previous prime is 21060023. The next prime is 21060049. The reversal of 21060037 is 73006012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21060037 - 2¹¹ = 21057989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1108423 = 21060037 / (2 + 1 + 0 + 6 + 0 + 0 + 3 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21059996 and 21060023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21060077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554193 + ... + 554230.

It is an arithmetic number, because the mean of its divisors is an integer number (5542120).

Almost surely, 2^21060037 is an apocalyptic number.

It is an amenable number.

21060037 is a deficient number, since it is larger than the sum of its proper divisors (1108443).

21060037 is a wasteful number, since it uses less digits than its factorization.

21060037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108442.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 21060037 is about 4589.1215935078. The cubic root of 21060037 is about 276.1550841995.

Adding to 21060037 its reverse (73006012), we get a palindrome (94066049).

The spelling of 21060037 in words is "twenty-one million, sixty thousand, thirty-seven".