21114121012 has 6 divisors (see below), whose sum is σ = 36949711778. Its totient is φ = 10557060504.

The previous prime is 21114121009. The next prime is 21114121019. The reversal of 21114121012 is 21012141112.

It can be written as a sum of positive squares in only one way, i.e., 11432741776 + 9681379236 = 106924^2 + 98394^2 .

It is a super-2 number, since 2×21114121012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114121019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639265123 + ... + 2639265130.

Almost surely, 2^21114121012 is an apocalyptic number.

It is an amenable number.

21114121012 is a deficient number, since it is larger than the sum of its proper divisors (15835590766).

21114121012 is a wasteful number, since it uses less digits than its factorization.

21114121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278530257 (or 5278530255 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21114121012 its reverse (21012141112), we get a palindrome (42126262124).

The spelling of 21114121012 in words is "twenty-one billion, one hundred fourteen million, one hundred twenty-one thousand, twelve".