921236013 has 12 divisors (see below), whose sum is σ = 1335979008. Its totient is φ = 611709000.

The previous prime is 921235993. The next prime is 921236023. The reversal of 921236013 is 310632129.

It is not a de Polignac number, because 921236013 - 2¹⁶ = 921170477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921236023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201645 + ... + 206162.

It is an arithmetic number, because the mean of its divisors is an integer number (111331584).

Almost surely, 2^921236013 is an apocalyptic number.

It is an amenable number.

921236013 is a deficient number, since it is larger than the sum of its proper divisors (414742995).

921236013 is a wasteful number, since it uses less digits than its factorization.

921236013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408064 (or 408061 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 921236013 is about 30351.8700082878. The cubic root of 921236013 is about 973.0241865386.

The spelling of 921236013 in words is "nine hundred twenty-one million, two hundred thirty-six thousand, thirteen".