21340673690 has 32 divisors (see below), whose sum is σ = 44456532480. Its totient is φ = 7224182784.

The previous prime is 21340673677. The next prime is 21340673701. The reversal of 21340673690 is 9637604312.

It is a super-2 number, since 2×21340673690² (a number of 21 digits) contains 22 as substring.

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, 1924007 + ... + 1935066.

It is an arithmetic number, because the mean of its divisors is an integer number (1389266640).

Almost surely, 2^21340673690 is an apocalyptic number.

21340673690 is an abundant number, since it is smaller than the sum of its proper divisors (23115858790).

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

21340673690 is a wasteful number, since it uses less digits than its factorization.

21340673690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3859166.

The product of its (nonzero) digits is 163296, while the sum is 41.

The spelling of 21340673690 in words is "twenty-one billion, three hundred forty million, six hundred seventy-three thousand, six hundred ninety".