21601020499 has 2 divisors, whose sum is σ = 21601020500. Its totient is φ = 21601020498.

The previous prime is 21601020457. The next prime is 21601020541. The reversal of 21601020499 is 99402010612.

It is a balanced prime because it is at equal distance from previous prime (21601020457) and next prime (21601020541).

It is a cyclic number.

It is not a de Polignac number, because 21601020499 - 2²³ = 21592631891 is a prime.

It is not a weakly prime, because it can be changed into another prime (21601020299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800510249 + 10800510250.

It is an arithmetic number, because the mean of its divisors is an integer number (10800510250).

Almost surely, 2^21601020499 is an apocalyptic number.

21601020499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21601020499 is an equidigital number, since it uses as much as digits as its factorization.

21601020499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 21601020499 in words is "twenty-one billion, six hundred one million, twenty thousand, four hundred ninety-nine".