211212000001221 has 16 divisors (see below), whose sum is σ = 281680701603840. Its totient is φ = 140775652692720.

The previous prime is 211212000001217. The next prime is 211212000001229. The reversal of 211212000001221 is 122100000212112.

It is not a de Polignac number, because 211212000001221 - 2² = 211212000001217 is a prime.

It is a super-2 number, since 2×211212000001221² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211212000001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212000001229) 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, 246772350 + ... + 247626768.

It is an arithmetic number, because the mean of its divisors is an integer number (17605043850240).

Almost surely, 2^{211212000001221} is an apocalyptic number.

It is an amenable number.

211212000001221 is a deficient number, since it is larger than the sum of its proper divisors (70468701602619).

211212000001221 is a wasteful number, since it uses less digits than its factorization.

211212000001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873256.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211212000001221 its reverse (122100000212112), we get a palindrome (333312000213333).

The spelling of 211212000001221 in words is "two hundred eleven trillion, two hundred twelve billion, one thousand, two hundred twenty-one".