21690639207111 has 16 divisors (see below), whose sum is σ = 33089919545088. Its totient is φ = 12380582121600.

The previous prime is 21690639207077. The next prime is 21690639207121. The reversal of 21690639207111 is 11170293609612.

It is not a de Polignac number, because 21690639207111 - 2⁷ = 21690639206983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21690639207121) 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, 586183305 + ... + 586220306.

It is an arithmetic number, because the mean of its divisors is an integer number (2068119971568).

Almost surely, 2^{21690639207111} is an apocalyptic number.

21690639207111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21690639207111 is a deficient number, since it is larger than the sum of its proper divisors (11399280337977).

21690639207111 is a wasteful number, since it uses less digits than its factorization.

21690639207111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172404502.

The product of its (nonzero) digits is 244944, while the sum is 48.

The spelling of 21690639207111 in words is "twenty-one trillion, six hundred ninety billion, six hundred thirty-nine million, two hundred seven thousand, one hundred eleven".