21236234037 has 8 divisors (see below), whose sum is σ = 28315826400. Its totient is φ = 14157065520.

The previous prime is 21236234021. The next prime is 21236234069. The reversal of 21236234037 is 73043263212.

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

It is not a de Polignac number, because 21236234037 - 2⁴ = 21236234021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21236233989 and 21236234007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236234137) 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, 39462 + ... + 209832.

It is an arithmetic number, because the mean of its divisors is an integer number (3539478300).

Almost surely, 2^21236234037 is an apocalyptic number.

It is an amenable number.

21236234037 is a deficient number, since it is larger than the sum of its proper divisors (7079592363).

21236234037 is a wasteful number, since it uses less digits than its factorization.

21236234037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211923.

The product of its (nonzero) digits is 36288, while the sum is 33.

Adding to 21236234037 its reverse (73043263212), we get a palindrome (94279497249).

The spelling of 21236234037 in words is "twenty-one billion, two hundred thirty-six million, two hundred thirty-four thousand, thirty-seven".