21057414741 has 18 divisors (see below), whose sum is σ = 33432756630. Its totient is φ = 12762068880.

The previous prime is 21057414737. The next prime is 21057414757. The reversal of 21057414741 is 14741475012.

21057414741 is a `hidden beast` number, since 2 + 1 + 0 + 574 + 1 + 47 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13059689841 + 7997724900 = 114279^2 + 89430^2 .

It is not a de Polignac number, because 21057414741 - 2² = 21057414737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21057414696 and 21057414705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21057414761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9667146 + ... + 9669323.

Almost surely, 2^21057414741 is an apocalyptic number.

It is an amenable number.

21057414741 is a deficient number, since it is larger than the sum of its proper divisors (12375341889).

21057414741 is a wasteful number, since it uses less digits than its factorization.

21057414741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19336497 (or 19336483 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

Adding to 21057414741 its reverse (14741475012), we get a palindrome (35798889753).

The spelling of 21057414741 in words is "twenty-one billion, fifty-seven million, four hundred fourteen thousand, seven hundred forty-one".