212021022121 has 8 divisors (see below), whose sum is σ = 216818852864. Its totient is φ = 207265839120.

The previous prime is 212021022113. The next prime is 212021022133. The reversal of 212021022121 is 121220120212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 212021022121 - 2³ = 212021022113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212021022095 and 212021022104.

It is not an unprimeable number, because it can be changed into a prime (212021022181) 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, 10651881 + ... + 10671766.

It is an arithmetic number, because the mean of its divisors is an integer number (27102356608).

Almost surely, 2^212021022121 is an apocalyptic number.

It is an amenable number.

212021022121 is a deficient number, since it is larger than the sum of its proper divisors (4797830743).

212021022121 is a wasteful number, since it uses less digits than its factorization.

212021022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21323871.

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

Adding to 212021022121 its reverse (121220120212), we get a palindrome (333241142333).

The spelling of 212021022121 in words is "two hundred twelve billion, twenty-one million, twenty-two thousand, one hundred twenty-one".