1000212421391 has 2 divisors, whose sum is σ = 1000212421392. Its totient is φ = 1000212421390.

The previous prime is 1000212421349. The next prime is 1000212421463. The reversal of 1000212421391 is 1931242120001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000212421391 - 2²² = 1000208227087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000212421391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000212421301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500106210695 + 500106210696.

It is an arithmetic number, because the mean of its divisors is an integer number (500106210696).

Almost surely, 2^{1000212421391} is an apocalyptic number.

1000212421391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000212421391 is an equidigital number, since it uses as much as digits as its factorization.

1000212421391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 1000212421391 its reverse (1931242120001), we get a palindrome (2931454541392).

The spelling of 1000212421391 in words is "one trillion, two hundred twelve million, four hundred twenty-one thousand, three hundred ninety-one".