21014691012 has 144 divisors (see below), whose sum is σ = 62156045952. Its totient is φ = 5862205440.

The previous prime is 21014690987. The next prime is 21014691017. The reversal of 21014691012 is 21019641012.

It is not an unprimeable number, because it can be changed into a prime (21014691017) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2814388 + ... + 2821844.

It is an arithmetic number, because the mean of its divisors is an integer number (431639208).

Almost surely, 2^21014691012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21014691012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31078022976).

21014691012 is an abundant number, since it is smaller than the sum of its proper divisors (41141354940).

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

21014691012 is a wasteful number, since it uses less digits than its factorization.

21014691012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7738 (or 7733 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 21014691012 in words is "twenty-one billion, fourteen million, six hundred ninety-one thousand, twelve".