1212122220210 has 144 divisors (see below), whose sum is σ = 3529426387032. Its totient is φ = 288303375360.

The previous prime is 1212122220161. The next prime is 1212122220227. The reversal of 1212122220210 is 120222212121.

It is a happy number.

1212122220210 is a `hidden beast` number, since 1 + 21 + 212 + 2 + 220 + 210 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1166380560081 + 45741660129 = 1079991^2 + 213873^2 .

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 71 ways as a sum of consecutive naturals, for example, 472887 + ... + 1627226.

Almost surely, 2^{1212122220210} is an apocalyptic number.

1212122220210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212122220210 is an abundant number, since it is smaller than the sum of its proper divisors (2317304166822).

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

1212122220210 is a wasteful number, since it uses less digits than its factorization.

1212122220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100201 (or 2100187 counting only the distinct ones).

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

Adding to 1212122220210 its reverse (120222212121), we get a palindrome (1332344432331).

The spelling of 1212122220210 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred twenty thousand, two hundred ten".