1021211431421 has 16 divisors (see below), whose sum is σ = 1039505246208. Its totient is φ = 1003011649200.

The previous prime is 1021211431403. The next prime is 1021211431433. The reversal of 1021211431421 is 1241341121201.

It is a cyclic number.

It is not a de Polignac number, because 1021211431421 - 2²⁶ = 1021144322557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021211431921) 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, 33000326 + ... + 33031256.

It is an arithmetic number, because the mean of its divisors is an integer number (64969077888).

Almost surely, 2^{1021211431421} is an apocalyptic number.

It is an amenable number.

1021211431421 is a deficient number, since it is larger than the sum of its proper divisors (18293814787).

1021211431421 is an equidigital number, since it uses as much as digits as its factorization.

1021211431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32432.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 1021211431421 its reverse (1241341121201), we get a palindrome (2262552552622).

The spelling of 1021211431421 in words is "one trillion, twenty-one billion, two hundred eleven million, four hundred thirty-one thousand, four hundred twenty-one".