202121020021210 has 64 divisors (see below), whose sum is σ = 381718120762368. Its totient is φ = 76956232320000.

The previous prime is 202121020021199. The next prime is 202121020021243. The reversal of 202121020021210 is 12120020121202.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1532419365 + ... + 1532551255.

It is an arithmetic number, because the mean of its divisors is an integer number (5964345636912).

Almost surely, 2^{202121020021210} is an apocalyptic number.

202121020021210 is a deficient number, since it is larger than the sum of its proper divisors (179597100741158).

202121020021210 is a wasteful number, since it uses less digits than its factorization.

202121020021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213031.

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

Adding to 202121020021210 its reverse (12120020121202), we get a palindrome (214241040142412).

The spelling of 202121020021210 in words is "two hundred two trillion, one hundred twenty-one billion, twenty million, twenty-one thousand, two hundred ten".