1220212911 has 8 divisors (see below), whose sum is σ = 1651233664. Its totient is φ = 801333720.

The previous prime is 1220212897. The next prime is 1220212999. The reversal of 1220212911 is 1192120221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220212911 - 2⁵ = 1220212879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220212211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3035155 + ... + 3035556.

It is an arithmetic number, because the mean of its divisors is an integer number (206404208).

Almost surely, 2^1220212911 is an apocalyptic number.

1220212911 is a deficient number, since it is larger than the sum of its proper divisors (431020753).

1220212911 is an equidigital number, since it uses as much as digits as its factorization.

1220212911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6070781.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1220212911 is about 34931.5460722826. The cubic root of 1220212911 is about 1068.5918854768.

The spelling of 1220212911 in words is "one billion, two hundred twenty million, two hundred twelve thousand, nine hundred eleven".