40221121212 has 60 divisors (see below), whose sum is σ = 105609346920. Its totient is φ = 13347954144.

The previous prime is 40221121189. The next prime is 40221121231. The reversal of 40221121212 is 21212112204.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 199887 + ... + 346982.

It is an arithmetic number, because the mean of its divisors is an integer number (1760155782).

Almost surely, 2^40221121212 is an apocalyptic number.

It is an amenable number.

40221121212 is an abundant number, since it is smaller than the sum of its proper divisors (65388225708).

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

40221121212 is a wasteful number, since it uses less digits than its factorization.

40221121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547112 (or 547101 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 40221121212 its reverse (21212112204), we get a palindrome (61433233416).

The spelling of 40221121212 in words is "forty billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twelve".