121211240664 has 64 divisors (see below), whose sum is σ = 304102656000. Its totient is φ = 40260616704.

The previous prime is 121211240663. The next prime is 121211240669. The reversal of 121211240664 is 466042112121.

It is a super-2 number, since 2×121211240664² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211240663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19399989 + ... + 19406235.

It is an arithmetic number, because the mean of its divisors is an integer number (4751604000).

Almost surely, 2^121211240664 is an apocalyptic number.

It is an amenable number.

121211240664 is an abundant number, since it is smaller than the sum of its proper divisors (182891415336).

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

121211240664 is a wasteful number, since it uses less digits than its factorization.

121211240664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8992 (or 8988 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

Adding to 121211240664 its reverse (466042112121), we get a palindrome (587253352785).

The spelling of 121211240664 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred forty thousand, six hundred sixty-four".