1212222211020 has 72 divisors (see below), whose sum is σ = 3776454440304. Its totient is φ = 314522517888.

The previous prime is 1212222210967. The next prime is 1212222211027. The reversal of 1212222211020 is 201122222121.

It is a happy number.

1212222211020 is a `hidden beast` number, since 1 + 212 + 222 + 211 + 0 + 20 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1212222210984 and 1212222211002.

It is not an unprimeable number, because it can be changed into a prime (1212222211027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91001014 + ... + 91014333.

Almost surely, 2^{1212222211020} is an apocalyptic number.

1212222211020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212222211020 is an abundant number, since it is smaller than the sum of its proper divisors (2564232229284).

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

1212222211020 is a wasteful number, since it uses less digits than its factorization.

1212222211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182015399 (or 182015394 counting only the distinct ones).

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

Adding to 1212222211020 its reverse (201122222121), we get a palindrome (1413344433141).

The spelling of 1212222211020 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, two hundred eleven thousand, twenty".