21061741999 has 16 divisors (see below), whose sum is σ = 22559073984. Its totient is φ = 19619424000.

The previous prime is 21061741957. The next prime is 21061742029. The reversal of 21061741999 is 99914716012.

It is a cyclic number.

It is not a de Polignac number, because 21061741999 - 2²⁷ = 20927524271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21061771999) 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, 67387 + ... + 216019.

It is an arithmetic number, because the mean of its divisors is an integer number (1409942124).

Almost surely, 2^21061741999 is an apocalyptic number.

21061741999 is a deficient number, since it is larger than the sum of its proper divisors (1497331985).

21061741999 is a wasteful number, since it uses less digits than its factorization.

21061741999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148818.

The product of its (nonzero) digits is 244944, while the sum is 49.

The spelling of 21061741999 in words is "twenty-one billion, sixty-one million, seven hundred forty-one thousand, nine hundred ninety-nine".