21351435615001 has 4 divisors (see below), whose sum is σ = 21550981742352. Its totient is φ = 21151889487652.

The previous prime is 21351435614989. The next prime is 21351435615071. The reversal of 21351435615001 is 10051653415312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21351435615001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21351435615071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99773063515 + ... + 99773063728.

It is an arithmetic number, because the mean of its divisors is an integer number (5387745435588).

Almost surely, 2^{21351435615001} is an apocalyptic number.

It is an amenable number.

21351435615001 is a deficient number, since it is larger than the sum of its proper divisors (199546127351).

21351435615001 is a wasteful number, since it uses less digits than its factorization.

21351435615001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199546127350.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 21351435615001 in words is "twenty-one trillion, three hundred fifty-one billion, four hundred thirty-five million, six hundred fifteen thousand, one".