21252625212 has 192 divisors, whose sum is σ = 63717699584. Its totient is φ = 5363573760.

The previous prime is 21252625183. The next prime is 21252625241.

21252625212 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (21252625183) and next prime (21252625241).

It is a self number, because there is not a number n which added to its sum of digits gives 21252625212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2460333 + ... + 2468955.

Almost surely, 2^21252625212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21252625212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31858849792).

21252625212 is an abundant number, since it is smaller than the sum of its proper divisors (42465074372).

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

21252625212 is a wasteful number, since it uses less digits than its factorization.

21252625212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8748 (or 8746 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The spelling of 21252625212 in words is "twenty-one billion, two hundred fifty-two million, six hundred twenty-five thousand, two hundred twelve".