21019681022 has 4 divisors (see below), whose sum is σ = 31529521536. Its totient is φ = 10509840510.

The previous prime is 21019681021. The next prime is 21019681043. The reversal of 21019681022 is 22018691012.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21019681022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21019681021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5254920254 + ... + 5254920257.

It is an arithmetic number, because the mean of its divisors is an integer number (7882380384).

Almost surely, 2^21019681022 is an apocalyptic number.

21019681022 is a deficient number, since it is larger than the sum of its proper divisors (10509840514).

21019681022 is a wasteful number, since it uses less digits than its factorization.

21019681022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10509840513.

The product of its (nonzero) digits is 3456, while the sum is 32.

The spelling of 21019681022 in words is "twenty-one billion, nineteen million, six hundred eighty-one thousand, twenty-two".