20621345613142 has 4 divisors (see below), whose sum is σ = 30932018419716. Its totient is φ = 10310672806570.

The previous prime is 20621345613133. The next prime is 20621345613151. The reversal of 20621345613142 is 24131654312602.

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

It is an interprime number because it is at equal distance from previous prime (20621345613133) and next prime (20621345613151).

It is a super-2 number, since 2×20621345613142² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20621345613095 and 20621345613104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5155336403284 + ... + 5155336403287.

It is an arithmetic number, because the mean of its divisors is an integer number (7733004604929).

Almost surely, 2^{20621345613142} is an apocalyptic number.

20621345613142 is a deficient number, since it is larger than the sum of its proper divisors (10310672806574).

20621345613142 is a wasteful number, since it uses less digits than its factorization.

20621345613142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10310672806573.

The product of its (nonzero) digits is 207360, while the sum is 40.

Adding to 20621345613142 its reverse (24131654312602), we get a palindrome (44752999925744).

The spelling of 20621345613142 in words is "twenty trillion, six hundred twenty-one billion, three hundred forty-five million, six hundred thirteen thousand, one hundred forty-two".