21153155343 has 4 divisors (see below), whose sum is σ = 28204207128. Its totient is φ = 14102103560.

The previous prime is 21153155339. The next prime is 21153155347. The reversal of 21153155343 is 34355135112.

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

It is an interprime number because it is at equal distance from previous prime (21153155339) and next prime (21153155347).

It is a cyclic number.

It is not a de Polignac number, because 21153155343 - 2² = 21153155339 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153155347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3525525888 + ... + 3525525893.

It is an arithmetic number, because the mean of its divisors is an integer number (7051051782).

Almost surely, 2^21153155343 is an apocalyptic number.

21153155343 is a deficient number, since it is larger than the sum of its proper divisors (7051051785).

21153155343 is an equidigital number, since it uses as much as digits as its factorization.

21153155343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7051051784.

The product of its digits is 27000, while the sum is 33.

It can be divided in two parts, 211531553 and 43, that added together give a triangular number (211531596 = T₂₀₅₆₈).

The spelling of 21153155343 in words is "twenty-one billion, one hundred fifty-three million, one hundred fifty-five thousand, three hundred forty-three".