1220121210 has 64 divisors (see below), whose sum is σ = 3650863104. Its totient is φ = 253531200.

The previous prime is 1220121169. The next prime is 1220121247. The reversal of 1220121210 is 121210221.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261786 + ... + 266405.

It is an arithmetic number, because the mean of its divisors is an integer number (57044736).

Almost surely, 2^1220121210 is an apocalyptic number.

1220121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220121210 is an abundant number, since it is smaller than the sum of its proper divisors (2430741894).

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

1220121210 is a wasteful number, since it uses less digits than its factorization.

1220121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528219.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1220121210 is about 34930.2334661536. The cubic root of 1220121210 is about 1068.5651159958.

Adding to 1220121210 its reverse (121210221), we get a palindrome (1341331431).

It can be divided in two parts, 12201 and 21210, that added together give a triangular number (33411 = T₂₅₈).

The spelling of 1220121210 in words is "one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred ten".