21124201011 has 8 divisors (see below), whose sum is σ = 28193519760. Its totient is φ = 14068841472.

The previous prime is 21124200949. The next prime is 21124201013. The reversal of 21124201011 is 11010242112.

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

It is not a de Polignac number, because 21124201011 - 2⁷ = 21124200883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21124201013) 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 7 ways as a sum of consecutive naturals, for example, 3486270 + ... + 3492323.

It is an arithmetic number, because the mean of its divisors is an integer number (3524189970).

Almost surely, 2^21124201011 is an apocalyptic number.

21124201011 is a deficient number, since it is larger than the sum of its proper divisors (7069318749).

21124201011 is a wasteful number, since it uses less digits than its factorization.

21124201011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6979605.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21124201011 its reverse (11010242112), we get a palindrome (32134443123).

The spelling of 21124201011 in words is "twenty-one billion, one hundred twenty-four million, two hundred one thousand, eleven".