21919291207 has 12 divisors (see below), whose sum is σ = 25510349088. Its totient is φ = 18754472000.

The previous prime is 21919291189. The next prime is 21919291211. The reversal of 21919291207 is 70219291912.

It is not a de Polignac number, because 21919291207 - 2¹¹ = 21919289159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21919291007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5325919 + ... + 5330032.

It is an arithmetic number, because the mean of its divisors is an integer number (2125862424).

Almost surely, 2^21919291207 is an apocalyptic number.

21919291207 is a deficient number, since it is larger than the sum of its proper divisors (3591057881).

21919291207 is a wasteful number, since it uses less digits than its factorization.

21919291207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10655990 (or 10655979 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 21919291207 in words is "twenty-one billion, nine hundred nineteen million, two hundred ninety-one thousand, two hundred seven".