21001535234 has 8 divisors (see below), whose sum is σ = 31856261580. Its totient is φ = 10382781376.

The previous prime is 21001535231. The next prime is 21001535263. The reversal of 21001535234 is 43253510012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20812390225 + 189145009 = 144265^2 + 13753^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21001535231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58992899 + ... + 58993254.

Almost surely, 2^21001535234 is an apocalyptic number.

21001535234 is a deficient number, since it is larger than the sum of its proper divisors (10854726346).

21001535234 is a wasteful number, since it uses less digits than its factorization.

21001535234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117986244.

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 21001535234 in words is "twenty-one billion, one million, five hundred thirty-five thousand, two hundred thirty-four".