12212157856890 has 16 divisors (see below), whose sum is σ = 29309178856608. Its totient is φ = 3256575428496.

The previous prime is 12212157856889. The next prime is 12212157856907. The reversal of 12212157856890 is 9865875121221.

It is a self number, because there is not a number n which added to its sum of digits gives 12212157856890.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203535964252 + ... + 203535964311.

It is an arithmetic number, because the mean of its divisors is an integer number (1831823678538).

Almost surely, 2^{12212157856890} is an apocalyptic number.

12212157856890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12212157856890 is an abundant number, since it is smaller than the sum of its proper divisors (17097020999718).

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

12212157856890 is a wasteful number, since it uses less digits than its factorization.

12212157856890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407071928573.

The product of its (nonzero) digits is 4838400, while the sum is 57.

The spelling of 12212157856890 in words is "twelve trillion, two hundred twelve billion, one hundred fifty-seven million, eight hundred fifty-six thousand, eight hundred ninety".