20953821293 has 4 divisors (see below), whose sum is σ = 20956317408. Its totient is φ = 20951325180.

The previous prime is 20953821247. The next prime is 20953821299. The reversal of 20953821293 is 39212835902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20953821293 - 2¹⁴ = 20953804909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20953821299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1235423 + ... + 1252268.

It is an arithmetic number, because the mean of its divisors is an integer number (5239079352).

Almost surely, 2^20953821293 is an apocalyptic number.

It is an amenable number.

20953821293 is a deficient number, since it is larger than the sum of its proper divisors (2496115).

20953821293 is an equidigital number, since it uses as much as digits as its factorization.

20953821293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496114.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 20953821293 in words is "twenty billion, nine hundred fifty-three million, eight hundred twenty-one thousand, two hundred ninety-three".