1210012221 has 48 divisors (see below), whose sum is σ = 1900950912. Its totient is φ = 682323840.

The previous prime is 1210012187. The next prime is 1210012229. The reversal of 1210012221 is 1222100121.

It is not a de Polignac number, because 1210012221 - 2¹⁰ = 1210011197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210012197 and 1210012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210012229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 306955 + ... + 310871.

It is an arithmetic number, because the mean of its divisors is an integer number (39603144).

Almost surely, 2^1210012221 is an apocalyptic number.

1210012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210012221 is a deficient number, since it is larger than the sum of its proper divisors (690938691).

1210012221 is a wasteful number, since it uses less digits than its factorization.

1210012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002 (or 3991 counting only the distinct ones).

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

The square root of 1210012221 is about 34785.2299259326. The cubic root of 1210012221 is about 1065.6058242821.

Adding to 1210012221 its reverse (1222100121), we get a palindrome (2432112342).

The spelling of 1210012221 in words is "one billion, two hundred ten million, twelve thousand, two hundred twenty-one".