21150241212 has 24 divisors (see below), whose sum is σ = 52253537616. Its totient is φ = 6635369728.

The previous prime is 21150241199. The next prime is 21150241219. The reversal of 21150241212 is 21214205112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150241219) 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, 51838623 + ... + 51839030.

It is an arithmetic number, because the mean of its divisors is an integer number (2177230734).

Almost surely, 2^21150241212 is an apocalyptic number.

It is an amenable number.

21150241212 is an abundant number, since it is smaller than the sum of its proper divisors (31103296404).

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

21150241212 is a wasteful number, since it uses less digits than its factorization.

21150241212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103677677 (or 103677675 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21150241212 its reverse (21214205112), we get a palindrome (42364446324).

The spelling of 21150241212 in words is "twenty-one billion, one hundred fifty million, two hundred forty-one thousand, two hundred twelve".