21151036133 has 4 divisors (see below), whose sum is σ = 21440776428. Its totient is φ = 20861295840.

The previous prime is 21151036129. The next prime is 21151036147. The reversal of 21151036133 is 33163015112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7117790689 + 14033245444 = 84367^2 + 118462^2 .

It is a cyclic number.

It is not a de Polignac number, because 21151036133 - 2² = 21151036129 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151036033) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 144870038 + ... + 144870183.

It is an arithmetic number, because the mean of its divisors is an integer number (5360194107).

Almost surely, 2^21151036133 is an apocalyptic number.

It is an amenable number.

21151036133 is a deficient number, since it is larger than the sum of its proper divisors (289740295).

21151036133 is an equidigital number, since it uses as much as digits as its factorization.

21151036133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289740294.

The product of its (nonzero) digits is 1620, while the sum is 26.

The spelling of 21151036133 in words is "twenty-one billion, one hundred fifty-one million, thirty-six thousand, one hundred thirty-three".