21019018774 has 32 divisors (see below), whose sum is σ = 35751905280. Its totient is φ = 9187657632.

The previous prime is 21019018723. The next prime is 21019018843. The reversal of 21019018774 is 47781091012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2803659 + ... + 2811145.

It is an arithmetic number, because the mean of its divisors is an integer number (1117247040).

Almost surely, 2^21019018774 is an apocalyptic number.

21019018774 is a deficient number, since it is larger than the sum of its proper divisors (14732886506).

21019018774 is a wasteful number, since it uses less digits than its factorization.

21019018774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13204.

The product of its (nonzero) digits is 28224, while the sum is 40.

The spelling of 21019018774 in words is "twenty-one billion, nineteen million, eighteen thousand, seven hundred seventy-four".