1210212220021 has 8 divisors (see below), whose sum is σ = 1383107743040. Its totient is φ = 1037318712768.

The previous prime is 1210212220003. The next prime is 1210212220031. The reversal of 1210212220021 is 1200222120121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210212220021 is a prime.

It is a super-2 number, since 2×1210212220021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210212219977 and 1210212220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210212220031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1140190 + ... + 1928848.

It is an arithmetic number, because the mean of its divisors is an integer number (172888467880).

Almost surely, 2^{1210212220021} is an apocalyptic number.

It is an amenable number.

1210212220021 is a deficient number, since it is larger than the sum of its proper divisors (172895523019).

1210212220021 is an equidigital number, since it uses as much as digits as its factorization.

1210212220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007883.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1210212220021 its reverse (1200222120121), we get a palindrome (2410434340142).

The spelling of 1210212220021 in words is "one trillion, two hundred ten billion, two hundred twelve million, two hundred twenty thousand, twenty-one".