21155153513466 has 32 divisors (see below), whose sum is σ = 49914463592448. Its totient is φ = 5849351201520.

The previous prime is 21155153513443. The next prime is 21155153513479. The reversal of 21155153513466 is 66431535155112.

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, 8124097590 + ... + 8124100193.

It is an arithmetic number, because the mean of its divisors is an integer number (1559826987264).

Almost surely, 2^{21155153513466} is an apocalyptic number.

21155153513466 is an abundant number, since it is smaller than the sum of its proper divisors (28759310078982).

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

21155153513466 is a wasteful number, since it uses less digits than its factorization.

21155153513466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16248197826.

The product of its digits is 1620000, while the sum is 48.

Adding to 21155153513466 its reverse (66431535155112), we get a palindrome (87586688668578).

The spelling of 21155153513466 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-three million, five hundred thirteen thousand, four hundred sixty-six".