20121013 has 8 divisors (see below), whose sum is σ = 23241600. Its totient is φ = 17215680.

The previous prime is 20120999. The next prime is 20121043. The reversal of 20121013 is 31012102.

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 20121013 - 2⁹ = 20120501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121043) 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, 53613 + ... + 53986.

It is an arithmetic number, because the mean of its divisors is an integer number (2905200).

Almost surely, 2^20121013 is an apocalyptic number.

It is an amenable number.

20121013 is a deficient number, since it is larger than the sum of its proper divisors (3120587).

20121013 is a wasteful number, since it uses less digits than its factorization.

20121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107627.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20121013 is about 4485.6452155738. The cubic root of 20121013 is about 271.9881275455.

Adding to 20121013 its reverse (31012102), we get a palindrome (51133115).

It can be divided in two parts, 2012 and 1013, that added together give a square (3025 = 55²).

The spelling of 20121013 in words is "twenty million, one hundred twenty-one thousand, thirteen".