21651205041 has 32 divisors (see below), whose sum is σ = 32339913600. Its totient is φ = 14315512320.

The previous prime is 21651205021. The next prime is 21651205057. The reversal of 21651205041 is 14050215612.

21651205041 is a `hidden beast` number, since 2 + 1 + 651 + 2 + 0 + 5 + 0 + 4 + 1 = 666.

It is not a de Polignac number, because 21651205041 - 2¹⁰ = 21651204017 is a prime.

It is a super-3 number, since 3×21651205041³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21651204996 and 21651205014.

It is not an unprimeable number, because it can be changed into a prime (21651205021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5505846 + ... + 5509776.

It is an arithmetic number, because the mean of its divisors is an integer number (1010622300).

Almost surely, 2^21651205041 is an apocalyptic number.

It is an amenable number.

21651205041 is a deficient number, since it is larger than the sum of its proper divisors (10688708559).

21651205041 is a wasteful number, since it uses less digits than its factorization.

21651205041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5566 (or 5560 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 21651205041 in words is "twenty-one billion, six hundred fifty-one million, two hundred five thousand, forty-one".