2121354501 has 32 divisors (see below), whose sum is σ = 3329510400. Its totient is φ = 1200811248.

The previous prime is 2121354493. The next prime is 2121354511. The reversal of 2121354501 is 1054531212.

It is a happy number.

It is not a de Polignac number, because 2121354501 - 2³ = 2121354493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121354511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100470 + ... + 119736.

It is an arithmetic number, because the mean of its divisors is an integer number (104047200).

Almost surely, 2^2121354501 is an apocalyptic number.

2121354501 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2121354501 is a deficient number, since it is larger than the sum of its proper divisors (1208155899).

2121354501 is a wasteful number, since it uses less digits than its factorization.

2121354501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19398 (or 19384 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 2121354501 is about 46058.1643251226. The cubic root of 2121354501 is about 1284.9051898537.

Adding to 2121354501 its reverse (1054531212), we get a palindrome (3175885713).

The spelling of 2121354501 in words is "two billion, one hundred twenty-one million, three hundred fifty-four thousand, five hundred one".