21121211209964 has 12 divisors (see below), whose sum is σ = 38569168296624. Its totient is φ = 10101448839504.

The previous prime is 21121211209963. The next prime is 21121211210017. The reversal of 21121211209964 is 46990211212112.

It is a super-2 number, since 2×21121211209964² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121211209963) 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, 114789191267 + ... + 114789191450.

It is an arithmetic number, because the mean of its divisors is an integer number (3214097358052).

Almost surely, 2^{21121211209964} is an apocalyptic number.

It is an amenable number.

21121211209964 is a deficient number, since it is larger than the sum of its proper divisors (17447957086660).

21121211209964 is a wasteful number, since it uses less digits than its factorization.

21121211209964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229578382744 (or 229578382742 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The spelling of 21121211209964 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, two hundred nine thousand, nine hundred sixty-four".