21354625212 has 12 divisors (see below), whose sum is σ = 49827458856. Its totient is φ = 7118208400.

The previous prime is 21354625211. The next prime is 21354625219. The reversal of 21354625212 is 21252645312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354625211) 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, 889776039 + ... + 889776062.

It is an arithmetic number, because the mean of its divisors is an integer number (4152288238).

Almost surely, 2^21354625212 is an apocalyptic number.

It is an amenable number.

21354625212 is an abundant number, since it is smaller than the sum of its proper divisors (28472833644).

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

21354625212 is a wasteful number, since it uses less digits than its factorization.

21354625212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779552108 (or 1779552106 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The spelling of 21354625212 in words is "twenty-one billion, three hundred fifty-four million, six hundred twenty-five thousand, two hundred twelve".