21054145041 has 6 divisors (see below), whose sum is σ = 30411542850. Its totient is φ = 14036096688.

The previous prime is 21054145037. The next prime is 21054145069. The reversal of 21054145041 is 14054145012.

It can be written as a sum of positive squares in only one way, i.e., 21023840016 + 30305025 = 144996^2 + 5505^2 .

It is not a de Polignac number, because 21054145041 - 2² = 21054145037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21054144996 and 21054145014.

It is not an unprimeable number, because it can be changed into a prime (21054145031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1169674716 + ... + 1169674733.

It is an arithmetic number, because the mean of its divisors is an integer number (5068590475).

Almost surely, 2^21054145041 is an apocalyptic number.

It is an amenable number.

21054145041 is a deficient number, since it is larger than the sum of its proper divisors (9357397809).

21054145041 is a wasteful number, since it uses less digits than its factorization.

21054145041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339349455 (or 2339349452 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The spelling of 21054145041 in words is "twenty-one billion, fifty-four million, one hundred forty-five thousand, forty-one".