1021211421 has 4 divisors (see below), whose sum is σ = 1361615232. Its totient is φ = 680807612.

The previous prime is 1021211419. The next prime is 1021211453. The reversal of 1021211421 is 1241121201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021211421 - 2¹ = 1021211419 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021211421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021211491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170201901 + ... + 170201906.

It is an arithmetic number, because the mean of its divisors is an integer number (340403808).

Almost surely, 2^1021211421 is an apocalyptic number.

It is an amenable number.

1021211421 is a deficient number, since it is larger than the sum of its proper divisors (340403811).

1021211421 is an equidigital number, since it uses as much as digits as its factorization.

1021211421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340403810.

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

The square root of 1021211421 is about 31956.3987489204. The cubic root of 1021211421 is about 1007.0210629729.

Adding to 1021211421 its reverse (1241121201), we get a palindrome (2262332622).

The spelling of 1021211421 in words is "one billion, twenty-one million, two hundred eleven thousand, four hundred twenty-one".