21653052353004 has 24 divisors (see below), whose sum is σ = 50528111487280. Its totient is φ = 7217066594304.

The previous prime is 21653052353003. The next prime is 21653052353071. The reversal of 21653052353004 is 40035325035612.

It is a super-2 number, since 2×21653052353004² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21653052353003) 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, 77044309 + ... + 77324844.

Almost surely, 2^{21653052353004} is an apocalyptic number.

It is an amenable number.

21653052353004 is an abundant number, since it is smaller than the sum of its proper divisors (28875059134276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21653052353004 is a wasteful number, since it uses less digits than its factorization.

21653052353004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154380849 (or 154380847 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 39.

Adding to 21653052353004 its reverse (40035325035612), we get a palindrome (61688377388616).

The spelling of 21653052353004 in words is "twenty-one trillion, six hundred fifty-three billion, fifty-two million, three hundred fifty-three thousand, four".