21206614102 has 4 divisors (see below), whose sum is σ = 31809921156. Its totient is φ = 10603307050.

The previous prime is 21206614057. The next prime is 21206614141. The reversal of 21206614102 is 20141660212.

It is a happy number.

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

It is a super-2 number, since 2×21206614102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5301653524 + ... + 5301653527.

It is an arithmetic number, because the mean of its divisors is an integer number (7952480289).

Almost surely, 2^21206614102 is an apocalyptic number.

21206614102 is a deficient number, since it is larger than the sum of its proper divisors (10603307054).

21206614102 is a wasteful number, since it uses less digits than its factorization.

21206614102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10603307053.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 21206614102 in words is "twenty-one billion, two hundred six million, six hundred fourteen thousand, one hundred two".