122521013 has 4 divisors (see below), whose sum is σ = 122551980. Its totient is φ = 122490048.

The previous prime is 122520971. The next prime is 122521019. The reversal of 122521013 is 310125221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12229009 + 110292004 = 3497^2 + 10502^2 .

It is a cyclic number.

It is not a de Polignac number, because 122521013 - 2¹⁶ = 122455477 is a prime.

It is a super-2 number, since 2×122521013² = 30022797253092338, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 122520982 and 122521000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122521019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8498 + ... + 17811.

It is an arithmetic number, because the mean of its divisors is an integer number (30637995).

Almost surely, 2^122521013 is an apocalyptic number.

It is an amenable number.

122521013 is a deficient number, since it is larger than the sum of its proper divisors (30967).

122521013 is an equidigital number, since it uses as much as digits as its factorization.

122521013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30966.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 122521013 is about 11068.9210404628. The cubic root of 122521013 is about 496.6725898027.

Adding to 122521013 its reverse (310125221), we get a palindrome (432646234).

The spelling of 122521013 in words is "one hundred twenty-two million, five hundred twenty-one thousand, thirteen".