20123411213021 has 4 divisors (see below), whose sum is σ = 20123546544444. Its totient is φ = 20123275881600.

The previous prime is 20123411212951. The next prime is 20123411213027. The reversal of 20123411213021 is 12031211432102.

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 1395410625625 + 18728000587396 = 1181275^2 + 4327586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123411213021 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 (20123411213027) 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, 67442420 + ... + 67740141.

It is an arithmetic number, because the mean of its divisors is an integer number (5030886636111).

Almost surely, 2^{20123411213021} is an apocalyptic number.

It is an amenable number.

20123411213021 is a deficient number, since it is larger than the sum of its proper divisors (135331423).

20123411213021 is a wasteful number, since it uses less digits than its factorization.

20123411213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135331422.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 20123411213021 its reverse (12031211432102), we get a palindrome (32154622645123).

The spelling of 20123411213021 in words is "twenty trillion, one hundred twenty-three billion, four hundred eleven million, two hundred thirteen thousand, twenty-one".