1021210221211 has 16 divisors (see below), whose sum is σ = 1145849120640. Its totient is φ = 905362232320.

The previous prime is 1021210221197. The next prime is 1021210221221. The reversal of 1021210221211 is 1121220121201.

It is a cyclic number.

It is not a de Polignac number, because 1021210221211 - 2⁵ = 1021210221179 is a prime.

It is a super-4 number, since 4×1021210221211⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021210221221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25241011 + ... + 25281436.

It is an arithmetic number, because the mean of its divisors is an integer number (71615570040).

Almost surely, 2^{1021210221211} is an apocalyptic number.

1021210221211 is a deficient number, since it is larger than the sum of its proper divisors (124638899429).

1021210221211 is a wasteful number, since it uses less digits than its factorization.

1021210221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50522534.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1021210221211 its reverse (1121220121201), we get a palindrome (2142430342412).

It can be divided in two parts, 1021210 and 221211, that added together give a palindrome (1242421).

The spelling of 1021210221211 in words is "one trillion, twenty-one billion, two hundred ten million, two hundred twenty-one thousand, two hundred eleven".