21298111540993 has 8 divisors (see below), whose sum is σ = 24344626773312. Its totient is φ = 18252578276016.

The previous prime is 21298111540987. The next prime is 21298111540997. The reversal of 21298111540993 is 39904511189212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21298111540993 - 2⁹ = 21298111540481 is a prime.

It is a super-2 number, since 2×21298111540993² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21298111540997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245445355 + ... + 245532112.

It is an arithmetic number, because the mean of its divisors is an integer number (3043078346664).

Almost surely, 2^{21298111540993} is an apocalyptic number.

It is an amenable number.

21298111540993 is a deficient number, since it is larger than the sum of its proper divisors (3046515232319).

21298111540993 is an equidigital number, since it uses as much as digits as its factorization.

21298111540993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490983671.

The product of its (nonzero) digits is 1399680, while the sum is 55.

The spelling of 21298111540993 in words is "twenty-one trillion, two hundred ninety-eight billion, one hundred eleven million, five hundred forty thousand, nine hundred ninety-three".