210222012121 has 24 divisors (see below), whose sum is σ = 244718864712. Its totient is φ = 179827929600.

The previous prime is 210222012101. The next prime is 210222012149. The reversal of 210222012121 is 121210222012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 50473912896 + 159748099225 = 224664^2 + 399685^2 .

It is not a de Polignac number, because 210222012121 - 2⁹ = 210222011609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210222012095 and 210222012104.

It is not an unprimeable number, because it can be changed into a prime (210222012101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11948551 + ... + 11966131.

It is an arithmetic number, because the mean of its divisors is an integer number (10196619363).

Almost surely, 2^210222012121 is an apocalyptic number.

It is an amenable number.

210222012121 is a deficient number, since it is larger than the sum of its proper divisors (34496852591).

210222012121 is a wasteful number, since it uses less digits than its factorization.

210222012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23433 (or 23422 counting only the distinct ones).

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

Adding to 210222012121 its reverse (121210222012), we get a palindrome (331432234133).

It can be divided in two parts, 210222012 and 121, that multiplied together give a palindrome (25436863452).

The spelling of 210222012121 in words is "two hundred ten billion, two hundred twenty-two million, twelve thousand, one hundred twenty-one".