21355342144630 has 24 divisors (see below), whose sum is σ = 41623962739632. Its totient is φ = 7885049406624.

The previous prime is 21355342144603. The next prime is 21355342144637. The reversal of 21355342144630 is 3644124355312.

It is a super-2 number, since 2×21355342144630² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355342144637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6318146874 + ... + 6318150253.

It is an arithmetic number, because the mean of its divisors is an integer number (1734331780818).

Almost surely, 2^{21355342144630} is an apocalyptic number.

21355342144630 is a deficient number, since it is larger than the sum of its proper divisors (20268620595002).

21355342144630 is a wasteful number, since it uses less digits than its factorization.

21355342144630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12636297160 (or 12636297147 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 43.

Adding to 21355342144630 its reverse (3644124355312), we get a palindrome (24999466499942).

The spelling of 21355342144630 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred forty-two million, one hundred forty-four thousand, six hundred thirty".