121721526212 has 24 divisors (see below), whose sum is σ = 250252649472. Its totient is φ = 51071968800.

The previous prime is 121721526139. The next prime is 121721526247. The reversal of 121721526212 is 212625127121.

It is a super-2 number, since 2×121721526212² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106399364 + ... + 106400507.

It is an arithmetic number, because the mean of its divisors is an integer number (10427193728).

Almost surely, 2^121721526212 is an apocalyptic number.

It is an amenable number.

121721526212 is an abundant number, since it is smaller than the sum of its proper divisors (128531123260).

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

121721526212 is a wasteful number, since it uses less digits than its factorization.

121721526212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212799899 (or 212799897 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The spelling of 121721526212 in words is "one hundred twenty-one billion, seven hundred twenty-one million, five hundred twenty-six thousand, two hundred twelve".