2121603621016 has 32 divisors (see below), whose sum is σ = 4361672454480. Its totient is φ = 959470019200.

The previous prime is 2121603620971. The next prime is 2121603621061. The reversal of 2121603621016 is 6101263061212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2121603620971) and next prime (2121603621061).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61173355 + ... + 61208026.

Almost surely, 2^{2121603621016} is an apocalyptic number.

It is an amenable number.

2121603621016 is an abundant number, since it is smaller than the sum of its proper divisors (2240068833464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121603621016 is a wasteful number, since it uses less digits than its factorization.

2121603621016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122381595 (or 122381591 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

Adding to 2121603621016 its reverse (6101263061212), we get a palindrome (8222866682228).

The spelling of 2121603621016 in words is "two trillion, one hundred twenty-one billion, six hundred three million, six hundred twenty-one thousand, sixteen".