21171191980074 has 16 divisors (see below), whose sum is σ = 44833112428608. Its totient is φ = 6641942581952.

The previous prime is 21171191980019. The next prime is 21171191980097. The reversal of 21171191980074 is 47008919117112.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 21171191979999 and 21171191980026.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103780352742 + ... + 103780352945.

It is an arithmetic number, because the mean of its divisors is an integer number (2802069526788).

Almost surely, 2^{21171191980074} is an apocalyptic number.

21171191980074 is an abundant number, since it is smaller than the sum of its proper divisors (23661920448534).

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

21171191980074 is a wasteful number, since it uses less digits than its factorization.

21171191980074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207560705709.

The product of its (nonzero) digits is 254016, while the sum is 51.

The spelling of 21171191980074 in words is "twenty-one trillion, one hundred seventy-one billion, one hundred ninety-one million, nine hundred eighty thousand, seventy-four".