211221210121202 has 4 divisors (see below), whose sum is σ = 316831815181806. Its totient is φ = 105610605060600.

The previous prime is 211221210121193. The next prime is 211221210121247. The reversal of 211221210121202 is 202121012122112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 106850447248801 + 104370762872401 = 10336849^2 + 10216201^2 .

It is a super-2 number, since 2×211221210121202² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52805302530299 + ... + 52805302530302.

Almost surely, 2^{211221210121202} is an apocalyptic number.

211221210121202 is a deficient number, since it is larger than the sum of its proper divisors (105610605060604).

211221210121202 is a wasteful number, since it uses less digits than its factorization.

211221210121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105610605060603.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211221210121202 its reverse (202121012122112), we get a palindrome (413342222243314).

The spelling of 211221210121202 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty-one thousand, two hundred two".