21150012231212 has 12 divisors (see below), whose sum is σ = 37030781172840. Its totient is φ = 10569789038976.

The previous prime is 21150012231211. The next prime is 21150012231269. The reversal of 21150012231212 is 21213221005112.

It is not an unprimeable number, because it can be changed into a prime (21150012231211) 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, 1304260037 + ... + 1304276252.

It is an arithmetic number, because the mean of its divisors is an integer number (3085898431070).

Almost surely, 2^{21150012231212} is an apocalyptic number.

It is an amenable number.

21150012231212 is a deficient number, since it is larger than the sum of its proper divisors (15880768941628).

21150012231212 is a wasteful number, since it uses less digits than its factorization.

21150012231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608538320 (or 2608538318 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 21150012231212 its reverse (21213221005112), we get a palindrome (42363233236324).

The spelling of 21150012231212 in words is "twenty-one trillion, one hundred fifty billion, twelve million, two hundred thirty-one thousand, two hundred twelve".