211212122021021 has 8 divisors (see below), whose sum is σ = 232694543073888. Its totient is φ = 190109920810000.

The previous prime is 211212122020987. The next prime is 211212122021041. The reversal of 211212122021021 is 120120221212112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211212122021021 is a prime.

It is a super-2 number, since 2×211212122021021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211212122020984 and 211212122021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212122021041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95054959295 + ... + 95054961516.

It is an arithmetic number, because the mean of its divisors is an integer number (29086817884236).

Almost surely, 2^{211212122021021} is an apocalyptic number.

It is an amenable number.

211212122021021 is a deficient number, since it is larger than the sum of its proper divisors (21482421052867).

211212122021021 is a wasteful number, since it uses less digits than its factorization.

211212122021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190109920923.

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

Adding to 211212122021021 its reverse (120120221212112), we get a palindrome (331332343233133).

It can be divided in two parts, 2112121 and 22021021, that added together give a palindrome (24133142).

The spelling of 211212122021021 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred twenty-two million, twenty-one thousand, twenty-one".