21054311033 has 16 divisors (see below), whose sum is σ = 24591340800. Its totient is φ = 18018469728.

The previous prime is 21054311029. The next prime is 21054311039. The reversal of 21054311033 is 33011345012.

It is not a de Polignac number, because 21054311033 - 2² = 21054311029 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21054311039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174485 + ... + 269357.

It is an arithmetic number, because the mean of its divisors is an integer number (1536958800).

Almost surely, 2^21054311033 is an apocalyptic number.

It is an amenable number.

21054311033 is a deficient number, since it is larger than the sum of its proper divisors (3537029767).

21054311033 is an frugal number, since it uses more digits than its factorization.

21054311033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95541 (or 95527 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21054311033 its reverse (33011345012), we get a palindrome (54065656045).

The spelling of 21054311033 in words is "twenty-one billion, fifty-four million, three hundred eleven thousand, thirty-three".