21055131033 has 4 divisors (see below), whose sum is σ = 28073508048. Its totient is φ = 14036754020.

The previous prime is 21055130983. The next prime is 21055131059. The reversal of 21055131033 is 33013155012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21055131033 - 2⁶ = 21055130969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21055130994 and 21055131012.

It is not an unprimeable number, because it can be changed into a prime (21055131233) 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, 3509188503 + ... + 3509188508.

It is an arithmetic number, because the mean of its divisors is an integer number (7018377012).

Almost surely, 2^21055131033 is an apocalyptic number.

It is an amenable number.

21055131033 is a deficient number, since it is larger than the sum of its proper divisors (7018377015).

21055131033 is an equidigital number, since it uses as much as digits as its factorization.

21055131033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7018377014.

The product of its (nonzero) digits is 1350, while the sum is 24.

Adding to 21055131033 its reverse (33013155012), we get a palindrome (54068286045).

The spelling of 21055131033 in words is "twenty-one billion, fifty-five million, one hundred thirty-one thousand, thirty-three".