1210021011 has 10 divisors (see below), whose sum is σ = 1807562372. Its totient is φ = 806680620.

The previous prime is 1210021009. The next prime is 1210021037. The reversal of 1210021011 is 1101200121.

It is a happy number.

It is not a de Polignac number, because 1210021011 - 2¹ = 1210021009 is a prime.

It is a super-2 number, since 2×1210021011² = 2928301694122924242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210020984 and 1210021002.

It is not an unprimeable number, because it can be changed into a prime (1210021081) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7469185 + ... + 7469346.

Almost surely, 2^1210021011 is an apocalyptic number.

1210021011 is a deficient number, since it is larger than the sum of its proper divisors (597541361).

1210021011 is an equidigital number, since it uses as much as digits as its factorization.

1210021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14938543 (or 14938534 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1210021011 is about 34785.3562724317. The cubic root of 1210021011 is about 1065.6084046010.

Adding to 1210021011 its reverse (1101200121), we get a palindrome (2311221132).

The spelling of 1210021011 in words is "one billion, two hundred ten million, twenty-one thousand, eleven".