2621980121 has 2 divisors, whose sum is σ = 2621980122. Its totient is φ = 2621980120.

The previous prime is 2621980037. The next prime is 2621980171. The reversal of 2621980121 is 1210891262.

2621980121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2375490121 + 246490000 = 48739^2 + 15700^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621980121 - 2¹⁸ = 2621717977 is a prime.

It is not a weakly prime, because it can be changed into another prime (2621980171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310990060 + 1310990061.

It is an arithmetic number, because the mean of its divisors is an integer number (1310990061).

Almost surely, 2^2621980121 is an apocalyptic number.

It is an amenable number.

2621980121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621980121 is an equidigital number, since it uses as much as digits as its factorization.

2621980121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 2621980121 is about 51205.2743474732. The cubic root of 2621980121 is about 1378.9328936377.

The spelling of 2621980121 in words is "two billion, six hundred twenty-one million, nine hundred eighty thousand, one hundred twenty-one".