2001212013421 has 2 divisors, whose sum is σ = 2001212013422. Its totient is φ = 2001212013420.

The previous prime is 2001212013389. The next prime is 2001212013433. The reversal of 2001212013421 is 1243102121002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1514302524900 + 486909488521 = 1230570^2 + 697789^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001212013421 - 2⁵ = 2001212013389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001212013221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000606006710 + 1000606006711.

It is an arithmetic number, because the mean of its divisors is an integer number (1000606006711).

Almost surely, 2^{2001212013421} is an apocalyptic number.

It is an amenable number.

2001212013421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001212013421 is an equidigital number, since it uses as much as digits as its factorization.

2001212013421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2001212013421 its reverse (1243102121002), we get a palindrome (3244314134423).

The spelling of 2001212013421 in words is "two trillion, one billion, two hundred twelve million, thirteen thousand, four hundred twenty-one".