21155401355330 has 24 divisors (see below), whose sum is σ = 41856223840956. Its totient is φ = 7692873219680.

The previous prime is 21155401355323. The next prime is 21155401355371. The reversal of 21155401355330 is 3355310455112.

It can be written as a sum of positive squares in 2 ways, for example, as 20788137478801 + 367263876529 = 4559401^2 + 606023^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8741900177 + ... + 8741902596.

Almost surely, 2^{21155401355330} is an apocalyptic number.

21155401355330 is a deficient number, since it is larger than the sum of its proper divisors (20700822485626).

21155401355330 is a wasteful number, since it uses less digits than its factorization.

21155401355330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17483802802 (or 17483802791 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 38.

The spelling of 21155401355330 in words is "twenty-one trillion, one hundred fifty-five billion, four hundred one million, three hundred fifty-five thousand, three hundred thirty".