21601625031143 has 4 divisors (see below), whose sum is σ = 21601639784208. Its totient is φ = 21601610278080.

The previous prime is 21601625031139. The next prime is 21601625031149. The reversal of 21601625031143 is 34113052610612.

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

It is a cyclic number.

It is not a de Polignac number, because 21601625031143 - 2² = 21601625031139 is a prime.

It is a super-2 number, since 2×21601625031143² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601625031149) 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, 4903946 + ... + 8200727.

It is an arithmetic number, because the mean of its divisors is an integer number (5400409946052).

Almost surely, 2^{21601625031143} is an apocalyptic number.

21601625031143 is a deficient number, since it is larger than the sum of its proper divisors (14753065).

21601625031143 is a wasteful number, since it uses less digits than its factorization.

21601625031143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14753064.

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 21601625031143 its reverse (34113052610612), we get a palindrome (55714677641755).

The spelling of 21601625031143 in words is "twenty-one trillion, six hundred one billion, six hundred twenty-five million, thirty-one thousand, one hundred forty-three".