21213612523266 has 32 divisors (see below), whose sum is σ = 42537894033600. Its totient is φ = 7052763379200.

The previous prime is 21213612523261. The next prime is 21213612523303. The reversal of 21213612523266 is 66232521631212.

It is not an unprimeable number, because it can be changed into a prime (21213612523261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20718630 + ... + 21718398.

It is an arithmetic number, because the mean of its divisors is an integer number (1329309188550).

Almost surely, 2^{21213612523266} is an apocalyptic number.

21213612523266 is an abundant number, since it is smaller than the sum of its proper divisors (21324281510334).

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

21213612523266 is a wasteful number, since it uses less digits than its factorization.

21213612523266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008994.

The product of its digits is 311040, while the sum is 42.

The spelling of 21213612523266 in words is "twenty-one trillion, two hundred thirteen billion, six hundred twelve million, five hundred twenty-three thousand, two hundred sixty-six".