21611723370253 has 8 divisors (see below), whose sum is σ = 22907164908672. Its totient is φ = 20318966686656.

The previous prime is 21611723370197. The next prime is 21611723370257. The reversal of 21611723370253 is 35207332711612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21611723370253 is a prime.

It is a super-4 number, since 4×21611723370253⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21611723370257) 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, 671197125 + ... + 671229322.

It is an arithmetic number, because the mean of its divisors is an integer number (2863395613584).

Almost surely, 2^{21611723370253} is an apocalyptic number.

It is an amenable number.

21611723370253 is a deficient number, since it is larger than the sum of its proper divisors (1295441538419).

21611723370253 is a wasteful number, since it uses less digits than its factorization.

21611723370253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342427411.

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 21611723370253 in words is "twenty-one trillion, six hundred eleven billion, seven hundred twenty-three million, three hundred seventy thousand, two hundred fifty-three".