21020244143398 has 4 divisors (see below), whose sum is σ = 31530366215100. Its totient is φ = 10510122071698.

The previous prime is 21020244143323. The next prime is 21020244143441. The reversal of 21020244143398 is 89334144202012.

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, 5255061035848 + ... + 5255061035851.

It is an arithmetic number, because the mean of its divisors is an integer number (7882591553775).

Almost surely, 2^{21020244143398} is an apocalyptic number.

21020244143398 is a deficient number, since it is larger than the sum of its proper divisors (10510122071702).

21020244143398 is a wasteful number, since it uses less digits than its factorization.

21020244143398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510122071701.

The product of its (nonzero) digits is 331776, while the sum is 43.

The spelling of 21020244143398 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty-three thousand, three hundred ninety-eight".