1012212020221 has 4 divisors (see below), whose sum is σ = 1012214762944. Its totient is φ = 1012209277500.

The previous prime is 1012212020219. The next prime is 1012212020227. The reversal of 1012212020221 is 1220202122101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1012212020221 - 2¹ = 1012212020219 is a prime.

It is a super-2 number, since 2×1012212020221² (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 = 1012212020195 and 1012212020204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012212020227) 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, 712155 + ... + 1591096.

It is an arithmetic number, because the mean of its divisors is an integer number (253053690736).

Almost surely, 2^{1012212020221} is an apocalyptic number.

It is an amenable number.

1012212020221 is a deficient number, since it is larger than the sum of its proper divisors (2742723).

1012212020221 is an equidigital number, since it uses as much as digits as its factorization.

1012212020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742722.

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

Adding to 1012212020221 its reverse (1220202122101), we get a palindrome (2232414142322).

The spelling of 1012212020221 in words is "one trillion, twelve billion, two hundred twelve million, twenty thousand, two hundred twenty-one".