2521621011 has 16 divisors (see below), whose sum is σ = 4138045184. Its totient is φ = 1330085664.

The previous prime is 2521620949. The next prime is 2521621051. The reversal of 2521621011 is 1101261252.

It is not a de Polignac number, because 2521621011 - 2⁶ = 2521620947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2521621051) 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, 4618081 + ... + 4618626.

It is an arithmetic number, because the mean of its divisors is an integer number (258627824).

Almost surely, 2^2521621011 is an apocalyptic number.

2521621011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2521621011 is a deficient number, since it is larger than the sum of its proper divisors (1616424173).

2521621011 is a wasteful number, since it uses less digits than its factorization.

2521621011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9236730.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 2521621011 is about 50215.7446524494. The cubic root of 2521621011 is about 1361.1101465787.

Adding to 2521621011 its reverse (1101261252), we get a palindrome (3622882263).

The spelling of 2521621011 in words is "two billion, five hundred twenty-one million, six hundred twenty-one thousand, eleven".