1210212021 has 32 divisors (see below), whose sum is σ = 1720506240. Its totient is φ = 755225856.

The previous prime is 1210211941. The next prime is 1210212023. The reversal of 1210212021 is 1202120121.

It is not a de Polignac number, because 1210212021 - 2¹⁰ = 1210210997 is a prime.

It is a super-2 number, since 2×1210212021² = 2929226271545808882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1210211988 and 1210212006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210212023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1277470 + ... + 1278416.

It is an arithmetic number, because the mean of its divisors is an integer number (53765820).

Almost surely, 2^1210212021 is an apocalyptic number.

It is an amenable number.

1210212021 is a deficient number, since it is larger than the sum of its proper divisors (510294219).

1210212021 is a wasteful number, since it uses less digits than its factorization.

1210212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413.

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

The square root of 1210212021 is about 34788.1017159603. The cubic root of 1210212021 is about 1065.6644728154.

Adding to 1210212021 its reverse (1202120121), we get a palindrome (2412332142).

The spelling of 1210212021 in words is "one billion, two hundred ten million, two hundred twelve thousand, twenty-one".