2122001421 has 16 divisors (see below), whose sum is σ = 3040484544. Its totient is φ = 1311577344.

The previous prime is 2122001419. The next prime is 2122001437. The reversal of 2122001421 is 1241002212.

It is not a de Polignac number, because 2122001421 - 2¹ = 2122001419 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2122001421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122001411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307090 + ... + 313923.

It is an arithmetic number, because the mean of its divisors is an integer number (190030284).

Almost surely, 2^2122001421 is an apocalyptic number.

It is an amenable number.

2122001421 is a deficient number, since it is larger than the sum of its proper divisors (918483123).

2122001421 is a wasteful number, since it uses less digits than its factorization.

2122001421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621100.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2122001421 is about 46065.1866489218. The cubic root of 2122001421 is about 1285.0357898050.

Adding to 2122001421 its reverse (1241002212), we get a palindrome (3363003633).

The spelling of 2122001421 in words is "two billion, one hundred twenty-two million, one thousand, four hundred twenty-one".