2097219001621 has 2 divisors, whose sum is σ = 2097219001622. Its totient is φ = 2097219001620.

The previous prime is 2097219001543. The next prime is 2097219001649. The reversal of 2097219001621 is 1261009127902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1772330401521 + 324888600100 = 1331289^2 + 569990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2097219001621 - 2²⁹ = 2096682130709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2097219001121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1048609500810 + 1048609500811.

It is an arithmetic number, because the mean of its divisors is an integer number (1048609500811).

Almost surely, 2^{2097219001621} is an apocalyptic number.

It is an amenable number.

2097219001621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2097219001621 is an equidigital number, since it uses as much as digits as its factorization.

2097219001621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The spelling of 2097219001621 in words is "two trillion, ninety-seven billion, two hundred nineteen million, one thousand, six hundred twenty-one".