1021212021 has 8 divisors (see below), whose sum is σ = 1361838240. Its totient is φ = 680696912.

The previous prime is 1021212007. The next prime is 1021212043. The reversal of 1021212021 is 1202121201.

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 1021212021 - 2²¹ = 1019114869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021211988 and 1021212006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021212091) 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, 3231 + ... + 45308.

It is an arithmetic number, because the mean of its divisors is an integer number (170229780).

Almost surely, 2^1021212021 is an apocalyptic number.

It is an amenable number.

1021212021 is a deficient number, since it is larger than the sum of its proper divisors (340626219).

1021212021 is an equidigital number, since it uses as much as digits as its factorization.

1021212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55555.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1021212021 is about 31956.4081367102. The cubic root of 1021212021 is about 1007.0212601937.

Adding to 1021212021 its reverse (1202121201), we get a palindrome (2223333222).

The spelling of 1021212021 in words is "one billion, twenty-one million, two hundred twelve thousand, twenty-one".