2520164421 has 24 divisors (see below), whose sum is σ = 3777795840. Its totient is φ = 1678892832.

The previous prime is 2520164417. The next prime is 2520164443. The reversal of 2520164421 is 1244610252.

It is not a de Polignac number, because 2520164421 - 2² = 2520164417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520164321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 440145 + ... + 445833.

It is an arithmetic number, because the mean of its divisors is an integer number (157408160).

Almost surely, 2^2520164421 is an apocalyptic number.

It is an amenable number.

2520164421 is a deficient number, since it is larger than the sum of its proper divisors (1257631419).

2520164421 is an equidigital number, since it uses as much as digits as its factorization.

2520164421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7527 (or 7515 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 2520164421 is about 50201.2392376921. The cubic root of 2520164421 is about 1360.8480187277.

Adding to 2520164421 its reverse (1244610252), we get a palindrome (3764774673).

The spelling of 2520164421 in words is "two billion, five hundred twenty million, one hundred sixty-four thousand, four hundred twenty-one".