20598726571421 has 16 divisors (see below), whose sum is σ = 22461407139840. Its totient is φ = 18818348502960.

The previous prime is 20598726571403. The next prime is 20598726571463. The reversal of 20598726571421 is 12417562789502.

It is a cyclic number.

It is not a de Polignac number, because 20598726571421 - 2²² = 20598722377117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20598726571481) 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, 61621955 + ... + 61955328.

It is an arithmetic number, because the mean of its divisors is an integer number (1403837946240).

Almost surely, 2^{20598726571421} is an apocalyptic number.

It is an amenable number.

20598726571421 is a deficient number, since it is larger than the sum of its proper divisors (1862680568419).

20598726571421 is a wasteful number, since it uses less digits than its factorization.

20598726571421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123577616.

The product of its (nonzero) digits is 16934400, while the sum is 59.

The spelling of 20598726571421 in words is "twenty trillion, five hundred ninety-eight billion, seven hundred twenty-six million, five hundred seventy-one thousand, four hundred twenty-one".