21866919767602 has 64 divisors (see below), whose sum is σ = 40606982406144. Its totient is φ = 8599950169920.

The previous prime is 21866919767551. The next prime is 21866919767659. The reversal of 21866919767602 is 20676791966812.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20888827 + ... + 21910657.

It is an arithmetic number, because the mean of its divisors is an integer number (634484100096).

Almost surely, 2^{21866919767602} is an apocalyptic number.

21866919767602 is a deficient number, since it is larger than the sum of its proper divisors (18740062638542).

21866919767602 is a wasteful number, since it uses less digits than its factorization.

21866919767602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022543.

The product of its (nonzero) digits is 164602368, while the sum is 70.

The spelling of 21866919767602 in words is "twenty-one trillion, eight hundred sixty-six billion, nine hundred nineteen million, seven hundred sixty-seven thousand, six hundred two".