21011969426 has 16 divisors (see below), whose sum is σ = 36025896960. Its totient is φ = 9003785280.

The previous prime is 21011969399. The next prime is 21011969431. The reversal of 21011969426 is 62496911012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11831 + ... + 205338.

It is an arithmetic number, because the mean of its divisors is an integer number (2251618560).

Almost surely, 2^21011969426 is an apocalyptic number.

21011969426 is a deficient number, since it is larger than the sum of its proper divisors (15013927534).

21011969426 is a wasteful number, since it uses less digits than its factorization.

21011969426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224089.

The product of its (nonzero) digits is 46656, while the sum is 41.

The spelling of 21011969426 in words is "twenty-one billion, eleven million, nine hundred sixty-nine thousand, four hundred twenty-six".