21153755346 has 16 divisors (see below), whose sum is σ = 42345880704. Its totient is φ = 7044856784.

The previous prime is 21153755323. The next prime is 21153755351. The reversal of 21153755346 is 64355735112.

It is a junction number, because it is equal to n+sod(n) for n = 21153755298 and 21153755307.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1591581 + ... + 1604816.

It is an arithmetic number, because the mean of its divisors is an integer number (2646617544).

Almost surely, 2^21153755346 is an apocalyptic number.

21153755346 is an abundant number, since it is smaller than the sum of its proper divisors (21192125358).

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

21153755346 is a wasteful number, since it uses less digits than its factorization.

21153755346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197505.

The product of its digits is 378000, while the sum is 42.

The spelling of 21153755346 in words is "twenty-one billion, one hundred fifty-three million, seven hundred fifty-five thousand, three hundred forty-six".