21234153073 has 8 divisors (see below), whose sum is σ = 24923484992. Its totient is φ = 17708791536.

The previous prime is 21234153071. The next prime is 21234153107. The reversal of 21234153073 is 37035143212.

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 21234153073 - 2¹ = 21234153071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21234153071) 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, 40992315 + ... + 40992832.

It is an arithmetic number, because the mean of its divisors is an integer number (3115435624).

Almost surely, 2^21234153073 is an apocalyptic number.

It is an amenable number.

21234153073 is a deficient number, since it is larger than the sum of its proper divisors (3689331919).

21234153073 is an equidigital number, since it uses as much as digits as its factorization.

21234153073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81985191.

The product of its (nonzero) digits is 15120, while the sum is 31.

Adding to 21234153073 its reverse (37035143212), we get a palindrome (58269296285).

The spelling of 21234153073 in words is "twenty-one billion, two hundred thirty-four million, one hundred fifty-three thousand, seventy-three".