1000212231961 has 2 divisors, whose sum is σ = 1000212231962. Its totient is φ = 1000212231960.

The previous prime is 1000212231923. The next prime is 1000212232031. The reversal of 1000212231961 is 1691322120001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 905055406336 + 95156825625 = 951344^2 + 308475^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000212231961 - 2²¹ = 1000210134809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1000212231911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500106115980 + 500106115981.

It is an arithmetic number, because the mean of its divisors is an integer number (500106115981).

Almost surely, 2^{1000212231961} is an apocalyptic number.

It is an amenable number.

1000212231961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000212231961 is an equidigital number, since it uses as much as digits as its factorization.

1000212231961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

Adding to 1000212231961 its reverse (1691322120001), we get a palindrome (2691534351962).

The spelling of 1000212231961 in words is "one trillion, two hundred twelve million, two hundred thirty-one thousand, nine hundred sixty-one".