1210212011 has 4 divisors (see below), whose sum is σ = 1273907400. Its totient is φ = 1146516624.

The previous prime is 1210211941. The next prime is 1210212023. The reversal of 1210212011 is 1102120121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1102120121 = 277 ⋅3978773.

It is a cyclic number.

It is not a de Polignac number, because 1210212011 - 2¹⁴ = 1210195627 is a prime.

It is a super-2 number, since 2×1210212011² = 2929226223137328242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210211983 and 1210212001.

It is not an unprimeable number, because it can be changed into a prime (1210212041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31847666 + ... + 31847703.

It is an arithmetic number, because the mean of its divisors is an integer number (318476850).

Almost surely, 2^1210212011 is an apocalyptic number.

1210212011 is a deficient number, since it is larger than the sum of its proper divisors (63695389).

1210212011 is an equidigital number, since it uses as much as digits as its factorization.

1210212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63695388.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1210212011 is about 34788.1015722330. The cubic root of 1210212011 is about 1065.6644698802.

Adding to 1210212011 its reverse (1102120121), we get a palindrome (2312332132).

It can be divided in two parts, 1 and 210212011, that added together give a palindrome (210212012).

The spelling of 1210212011 in words is "one billion, two hundred ten million, two hundred twelve thousand, eleven".