21511051041 has 8 divisors (see below), whose sum is σ = 29151588544. Its totient is φ = 14105607120.

The previous prime is 21511051013. The next prime is 21511051087. The reversal of 21511051041 is 14015011512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21511051041 - 2¹⁰ = 21511050017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21511050999 and 21511051017.

It is not an unprimeable number, because it can be changed into a prime (21511051091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58773181 + ... + 58773546.

It is an arithmetic number, because the mean of its divisors is an integer number (3643948568).

Almost surely, 2^21511051041 is an apocalyptic number.

It is an amenable number.

21511051041 is a deficient number, since it is larger than the sum of its proper divisors (7640537503).

21511051041 is a wasteful number, since it uses less digits than its factorization.

21511051041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117546791.

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 21511051041 its reverse (14015011512), we get a palindrome (35526062553).

The spelling of 21511051041 in words is "twenty-one billion, five hundred eleven million, fifty-one thousand, forty-one".