21011719949248 has 28 divisors (see below), whose sum is σ = 47651579171632. Its totient is φ = 9005022835200.

The previous prime is 21011719949243. The next prime is 21011719949287. The reversal of 21011719949248 is 84294991711012.

It is a tau number, because it is divible by the number of its divisors (28).

It is a junction number, because it is equal to n+sod(n) for n = 21011719949192 and 21011719949201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011719949243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23450579853 + ... + 23450580748.

Almost surely, 2^{21011719949248} is an apocalyptic number.

21011719949248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21011719949248 is an abundant number, since it is smaller than the sum of its proper divisors (26639859222384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011719949248 is an equidigital number, since it uses as much as digits as its factorization.

21011719949248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46901160620 (or 46901160610 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 58.

The spelling of 21011719949248 in words is "twenty-one trillion, eleven billion, seven hundred nineteen million, nine hundred forty-nine thousand, two hundred forty-eight".