21147474741 has 4 divisors (see below), whose sum is σ = 28196632992. Its totient is φ = 14098316492.

The previous prime is 21147474731. The next prime is 21147474781. The reversal of 21147474741 is 14747474112.

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 21147474741 - 2⁷ = 21147474613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21147474693 and 21147474702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147474701) 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, 3524579121 + ... + 3524579126.

It is an arithmetic number, because the mean of its divisors is an integer number (7049158248).

Almost surely, 2^21147474741 is an apocalyptic number.

It is an amenable number.

21147474741 is a deficient number, since it is larger than the sum of its proper divisors (7049158251).

21147474741 is an equidigital number, since it uses as much as digits as its factorization.

21147474741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7049158250.

The product of its digits is 175616, while the sum is 42.

The spelling of 21147474741 in words is "twenty-one billion, one hundred forty-seven million, four hundred seventy-four thousand, seven hundred forty-one".