2520121021 has 8 divisors (see below), whose sum is σ = 2910942144. Its totient is φ = 2156253120.

The previous prime is 2520121003. The next prime is 2520121033. The reversal of 2520121021 is 1201210252.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2520121021 - 2⁷ = 2520120893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2520120986 and 2520121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520121061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6738105 + ... + 6738478.

It is an arithmetic number, because the mean of its divisors is an integer number (363867768).

Almost surely, 2^2520121021 is an apocalyptic number.

It is an amenable number.

2520121021 is a deficient number, since it is larger than the sum of its proper divisors (390821123).

2520121021 is a wasteful number, since it uses less digits than its factorization.

2520121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13476611.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 2520121021 is about 50200.8069755856. The cubic root of 2520121021 is about 1360.8402069169.

Adding to 2520121021 its reverse (1201210252), we get a palindrome (3721331273).

The spelling of 2520121021 in words is "two billion, five hundred twenty million, one hundred twenty-one thousand, twenty-one".