21041221043212 has 12 divisors (see below), whose sum is σ = 36822734718336. Its totient is φ = 10520439695120.

The previous prime is 21041221043189. The next prime is 21041221043257. The reversal of 21041221043212 is 21234012214012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42429283 + ... + 42922330.

It is an arithmetic number, because the mean of its divisors is an integer number (3068561226528).

Almost surely, 2^{21041221043212} is an apocalyptic number.

It is an amenable number.

21041221043212 is a deficient number, since it is larger than the sum of its proper divisors (15781513675124).

21041221043212 is a wasteful number, since it uses less digits than its factorization.

21041221043212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85413248 (or 85413246 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 21041221043212 its reverse (21234012214012), we get a palindrome (42275233257224).

The spelling of 21041221043212 in words is "twenty-one trillion, forty-one billion, two hundred twenty-one million, forty-three thousand, two hundred twelve".