21355420001445 has 16 divisors (see below), whose sum is σ = 37965191113920. Its totient is φ = 11389557334032.

The previous prime is 21355420001429. The next prime is 21355420001473. The reversal of 21355420001445 is 54410002455312.

21355420001445 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 5 + 4 + 200 + 0 + 1 + 445 = 666.

It is not a de Polignac number, because 21355420001445 - 2⁴ = 21355420001429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79094148019 + ... + 79094148288.

It is an arithmetic number, because the mean of its divisors is an integer number (2372824444620).

Almost surely, 2^{21355420001445} is an apocalyptic number.

It is an amenable number.

21355420001445 is a deficient number, since it is larger than the sum of its proper divisors (16609771112475).

21355420001445 is a wasteful number, since it uses less digits than its factorization.

21355420001445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158188296321 (or 158188296315 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

Adding to 21355420001445 its reverse (54410002455312), we get a palindrome (75765422456757).

The spelling of 21355420001445 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred twenty million, one thousand, four hundred forty-five".