21073437011 has 8 divisors (see below), whose sum is σ = 23001836544. Its totient is φ = 19147142920.

The previous prime is 21073436983. The next prime is 21073437071. The reversal of 21073437011 is 11073437012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21073437011 - 2¹⁸ = 21073174867 is a prime.

It is a super-2 number, since 2×21073437011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21073437071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505391 + ... + 545496.

It is an arithmetic number, because the mean of its divisors is an integer number (2875229568).

Almost surely, 2^21073437011 is an apocalyptic number.

21073437011 is a deficient number, since it is larger than the sum of its proper divisors (1928399533).

21073437011 is a wasteful number, since it uses less digits than its factorization.

21073437011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052721.

The product of its (nonzero) digits is 3528, while the sum is 29.

Subtracting from 21073437011 its reverse (11073437012), we obtain a palindrome (9999999999).

The spelling of 21073437011 in words is "twenty-one billion, seventy-three million, four hundred thirty-seven thousand, eleven".