21365554430554 has 32 divisors (see below), whose sum is σ = 35841563884800. Its totient is φ = 9507446383680.

The previous prime is 21365554430491. The next prime is 21365554430567. The reversal of 21365554430554 is 45503445556312.

It is a super-2 number, since 2×21365554430554² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261958962 + ... + 262040509.

It is an arithmetic number, because the mean of its divisors is an integer number (1120048871400).

Almost surely, 2^{21365554430554} is an apocalyptic number.

21365554430554 is a deficient number, since it is larger than the sum of its proper divisors (14476009454246).

21365554430554 is a wasteful number, since it uses less digits than its factorization.

21365554430554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523999558.

The product of its (nonzero) digits is 21600000, while the sum is 52.

Adding to 21365554430554 its reverse (45503445556312), we get a palindrome (66868999986866).

The spelling of 21365554430554 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred fifty-four million, four hundred thirty thousand, five hundred fifty-four".