121222021221000 has 192 divisors, whose sum is σ = 468263350788480. Its totient is φ = 27707890550400.

The previous prime is 121222021220977. The next prime is 121222021221011. The reversal of 121222021221000 is 122120222121.

It is a happy number.

121222021221000 is a `hidden beast` number, since 1 + 21 + 2 + 220 + 212 + 210 + 0 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 962016534 + ... + 962142533.

It is an arithmetic number, because the mean of its divisors is an integer number (2438871618690).

Almost surely, 2^{121222021221000} is an apocalyptic number.

121222021221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222021221000 is an abundant number, since it is smaller than the sum of its proper divisors (347041329567480).

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

121222021221000 is a wasteful number, since it uses less digits than its factorization.

121222021221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924159101 (or 1924159084 counting only the distinct ones).

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

Adding to 121222021221000 its reverse (122120222121), we get a palindrome (121344141443121).

The spelling of 121222021221000 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, twenty-one million, two hundred twenty-one thousand".