20421520101142 has 4 divisors (see below), whose sum is σ = 30632280151716. Its totient is φ = 10210760050570.

The previous prime is 20421520101089. The next prime is 20421520101179. The reversal of 20421520101142 is 24110102512402.

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

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, 5105380025284 + ... + 5105380025287.

It is an arithmetic number, because the mean of its divisors is an integer number (7658070037929).

Almost surely, 2^{20421520101142} is an apocalyptic number.

20421520101142 is a deficient number, since it is larger than the sum of its proper divisors (10210760050574).

20421520101142 is a wasteful number, since it uses less digits than its factorization.

20421520101142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10210760050573.

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 20421520101142 its reverse (24110102512402), we get a palindrome (44531622613544).

The spelling of 20421520101142 in words is "twenty trillion, four hundred twenty-one billion, five hundred twenty million, one hundred one thousand, one hundred forty-two".