21213404665011 has 96 divisors (see below), whose sum is σ = 36282818557440. Its totient is φ = 11817483144192.

The previous prime is 21213404664989. The next prime is 21213404665027. The reversal of 21213404665011 is 11056640431212.

21213404665011 is a `hidden beast` number, since 2 + 1 + 2 + 134 + 0 + 466 + 50 + 11 = 666.

It is not a de Polignac number, because 21213404665011 - 2⁷ = 21213404664883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21213404665111) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 49740700 + ... + 50165366.

It is an arithmetic number, because the mean of its divisors is an integer number (377946026640).

Almost surely, 2^{21213404665011} is an apocalyptic number.

21213404665011 is a deficient number, since it is larger than the sum of its proper divisors (15069413892429).

21213404665011 is a wasteful number, since it uses less digits than its factorization.

21213404665011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425705 (or 425702 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 21213404665011 in words is "twenty-one trillion, two hundred thirteen billion, four hundred four million, six hundred sixty-five thousand, eleven".