211212111021 has 16 divisors (see below), whose sum is σ = 291435258048. Its totient is φ = 135956620800.

The previous prime is 211212111013. The next prime is 211212111029. The reversal of 211212111021 is 120111212112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (211212111013) and next prime (211212111029).

It is not a de Polignac number, because 211212111021 - 2³ = 211212111013 is a prime.

It is a super-2 number, since 2×211212111021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212111029) 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, 7248100 + ... + 7277181.

It is an arithmetic number, because the mean of its divisors is an integer number (18214703628).

Almost surely, 2^211212111021 is an apocalyptic number.

It is an amenable number.

211212111021 is a deficient number, since it is larger than the sum of its proper divisors (80223147027).

211212111021 is a wasteful number, since it uses less digits than its factorization.

211212111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14525452.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 211212111021 its reverse (120111212112), we get a palindrome (331323323133).

The spelling of 211212111021 in words is "two hundred eleven billion, two hundred twelve million, one hundred eleven thousand, twenty-one".