21353240601 has 64 divisors (see below), whose sum is σ = 39580784640. Its totient is φ = 11053091520.

The previous prime is 21353240591. The next prime is 21353240621. The reversal of 21353240601 is 10604235312.

21353240601 is a `hidden beast` number, since 2 + 1 + 3 + 53 + 2 + 4 + 0 + 601 = 666.

It is not a de Polignac number, because 21353240601 - 2⁵ = 21353240569 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21353240621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 570211 + ... + 606503.

It is an arithmetic number, because the mean of its divisors is an integer number (618449760).

Almost surely, 2^21353240601 is an apocalyptic number.

21353240601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21353240601 is a deficient number, since it is larger than the sum of its proper divisors (18227544039).

21353240601 is a wasteful number, since it uses less digits than its factorization.

21353240601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36603 (or 36597 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21353240601 its reverse (10604235312), we get a palindrome (31957475913).

The spelling of 21353240601 in words is "twenty-one billion, three hundred fifty-three million, two hundred forty thousand, six hundred one".