20121302021 has 4 divisors (see below), whose sum is σ = 20226649344. Its totient is φ = 20015954700.

The previous prime is 20121301997. The next prime is 20121302027. The reversal of 20121302021 is 12020312102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20121302021 - 2¹⁴ = 20121285637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121301987 and 20121302005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121302027) 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, 52673375 + ... + 52673756.

It is an arithmetic number, because the mean of its divisors is an integer number (5056662336).

Almost surely, 2^20121302021 is an apocalyptic number.

It is an amenable number.

20121302021 is a deficient number, since it is larger than the sum of its proper divisors (105347323).

20121302021 is a wasteful number, since it uses less digits than its factorization.

20121302021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105347322.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20121302021 its reverse (12020312102), we get a palindrome (32141614123).

The spelling of 20121302021 in words is "twenty billion, one hundred twenty-one million, three hundred two thousand, twenty-one".