21705862102 has 8 divisors (see below), whose sum is σ = 32560277112. Its totient is φ = 10852436400.

The previous prime is 21705862093. The next prime is 21705862109. The reversal of 21705862102 is 20126850712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21705862102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21705862109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189799 + ... + 281842.

It is an arithmetic number, because the mean of its divisors is an integer number (4070034639).

Almost surely, 2^21705862102 is an apocalyptic number.

21705862102 is a deficient number, since it is larger than the sum of its proper divisors (10854415010).

21705862102 is a wasteful number, since it uses less digits than its factorization.

21705862102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494654.

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 21705862102 in words is "twenty-one billion, seven hundred five million, eight hundred sixty-two thousand, one hundred two".