21020244143407 has 16 divisors (see below), whose sum is σ = 22082594913792. Its totient is φ = 19970300512800.

The previous prime is 21020244143323. The next prime is 21020244143441. The reversal of 21020244143407 is 70434144202012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020244143407 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 (21020244243407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23974113 + ... + 24835429.

It is an arithmetic number, because the mean of its divisors is an integer number (1380162182112).

Almost surely, 2^{21020244143407} is an apocalyptic number.

21020244143407 is a deficient number, since it is larger than the sum of its proper divisors (1062350770385).

21020244143407 is a wasteful number, since it uses less digits than its factorization.

21020244143407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868518.

The product of its (nonzero) digits is 43008, while the sum is 34.

Adding to 21020244143407 its reverse (70434144202012), we get a palindrome (91454388345419).

The spelling of 21020244143407 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty-three thousand, four hundred seven".