21163033955 has 8 divisors (see below), whose sum is σ = 29023589472. Its totient is φ = 14511794688.

The previous prime is 21163033949. The next prime is 21163033961. The reversal of 21163033955 is 55933036112.

It is an interprime number because it is at equal distance from previous prime (21163033949) and next prime (21163033961).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21163033955 - 2¹⁴ = 21163017571 is a prime.

It is a Duffinian number.

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, 302329022 + ... + 302329091.

It is an arithmetic number, because the mean of its divisors is an integer number (3627948684).

Almost surely, 2^21163033955 is an apocalyptic number.

21163033955 is a deficient number, since it is larger than the sum of its proper divisors (7860555517).

21163033955 is an equidigital number, since it uses as much as digits as its factorization.

21163033955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604658125.

The product of its (nonzero) digits is 72900, while the sum is 38.

The spelling of 21163033955 in words is "twenty-one billion, one hundred sixty-three million, thirty-three thousand, nine hundred fifty-five".