1211020055 has 24 divisors (see below), whose sum is σ = 1722399552. Its totient is φ = 814736832.

The previous prime is 1211020037. The next prime is 1211020061. The reversal of 1211020055 is 5500201121.

It is not a de Polignac number, because 1211020055 - 2¹⁴ = 1211003671 is a prime.

It is a super-2 number, since 2×1211020055² = 2933139147224406050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33647 + ... + 59616.

It is an arithmetic number, because the mean of its divisors is an integer number (71766648).

Almost surely, 2^1211020055 is an apocalyptic number.

1211020055 is a deficient number, since it is larger than the sum of its proper divisors (511379497).

1211020055 is an equidigital number, since it uses as much as digits as its factorization.

1211020055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93335 (or 93328 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 1211020055 is about 34799.7134327281. The cubic root of 1211020055 is about 1065.9015942282.

Adding to 1211020055 its reverse (5500201121), we get a palindrome (6711221176).

The spelling of 1211020055 in words is "one billion, two hundred eleven million, twenty thousand, fifty-five".