21110525212 has 24 divisors (see below), whose sum is σ = 42258510560. Its totient is φ = 9039340800.

The previous prime is 21110525209. The next prime is 21110525213. The reversal of 21110525212 is 21252501112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110525213) 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, 302289 + ... + 365512.

Almost surely, 2^21110525212 is an apocalyptic number.

It is an amenable number.

21110525212 is an abundant number, since it is smaller than the sum of its proper divisors (21147985348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21110525212 is a wasteful number, since it uses less digits than its factorization.

21110525212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668941 (or 668939 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The spelling of 21110525212 in words is "twenty-one billion, one hundred ten million, five hundred twenty-five thousand, two hundred twelve".