202121112212101 has 4 divisors (see below), whose sum is σ = 202135126031712. Its totient is φ = 202107098392492.

The previous prime is 202121112212053. The next prime is 202121112212119. The reversal of 202121112212101 is 101212211121202.

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 202121112212101 - 2¹¹ = 202121112210053 is a prime.

It is a super-2 number, since 2×202121112212101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121112212191) 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, 7006888171 + ... + 7006917016.

It is an arithmetic number, because the mean of its divisors is an integer number (50533781507928).

Almost surely, 2^{202121112212101} is an apocalyptic number.

It is an amenable number.

202121112212101 is a deficient number, since it is larger than the sum of its proper divisors (14013819611).

202121112212101 is a wasteful number, since it uses less digits than its factorization.

202121112212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14013819610.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 202121112212101 its reverse (101212211121202), we get a palindrome (303333323333303).

The spelling of 202121112212101 in words is "two hundred two trillion, one hundred twenty-one billion, one hundred twelve million, two hundred twelve thousand, one hundred one".