21352002431534 has 4 divisors (see below), whose sum is σ = 32028003647304. Its totient is φ = 10676001215766.

The previous prime is 21352002431531. The next prime is 21352002431581. The reversal of 21352002431534 is 43513420025312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21352002431494 and 21352002431503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352002431531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338000607882 + ... + 5338000607885.

It is an arithmetic number, because the mean of its divisors is an integer number (8007000911826).

Almost surely, 2^{21352002431534} is an apocalyptic number.

21352002431534 is a deficient number, since it is larger than the sum of its proper divisors (10676001215770).

21352002431534 is a wasteful number, since it uses less digits than its factorization.

21352002431534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10676001215769.

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 21352002431534 its reverse (43513420025312), we get a palindrome (64865422456846).

The spelling of 21352002431534 in words is "twenty-one trillion, three hundred fifty-two billion, two million, four hundred thirty-one thousand, five hundred thirty-four".