21124201012 has 12 divisors (see below), whose sum is σ = 36979225920. Its totient is φ = 10558707896.

The previous prime is 21124200949. The next prime is 21124201013. The reversal of 21124201012 is 21010242112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124201013) 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, 834118 + ... + 859069.

It is an arithmetic number, because the mean of its divisors is an integer number (3081602160).

Almost surely, 2^21124201012 is an apocalyptic number.

It is an amenable number.

21124201012 is a deficient number, since it is larger than the sum of its proper divisors (15855024908).

21124201012 is a wasteful number, since it uses less digits than its factorization.

21124201012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696310 (or 1696308 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21124201012 its reverse (21010242112), we get a palindrome (42134443124).

The spelling of 21124201012 in words is "twenty-one billion, one hundred twenty-four million, two hundred one thousand, twelve".