21655363034353 has 4 divisors (see below), whose sum is σ = 22402099690740. Its totient is φ = 20908626377968.

The previous prime is 21655363034351. The next prime is 21655363034369. The reversal of 21655363034353 is 35343036355612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15174631984369 + 6480731049984 = 3895463^2 + 2545728^2 .

It is a cyclic number.

It is not a de Polignac number, because 21655363034353 - 2¹ = 21655363034351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21655363034297 and 21655363034306.

It is not an unprimeable number, because it can be changed into a prime (21655363034351) 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, 373368328150 + ... + 373368328207.

It is an arithmetic number, because the mean of its divisors is an integer number (5600524922685).

Almost surely, 2^{21655363034353} is an apocalyptic number.

It is an amenable number.

21655363034353 is a deficient number, since it is larger than the sum of its proper divisors (746736656387).

21655363034353 is an equidigital number, since it uses as much as digits as its factorization.

21655363034353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746736656386.

The product of its (nonzero) digits is 8748000, while the sum is 49.

Adding to 21655363034353 its reverse (35343036355612), we get a palindrome (56998399389965).

The spelling of 21655363034353 in words is "twenty-one trillion, six hundred fifty-five billion, three hundred sixty-three million, thirty-four thousand, three hundred fifty-three".