21002122102 has 8 divisors (see below), whose sum is σ = 33926504976. Its totient is φ = 9693287112.

The previous prime is 21002122091. The next prime is 21002122109. The reversal of 21002122102 is 20122120012.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002122109) 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, 403886938 + ... + 403886989.

It is an arithmetic number, because the mean of its divisors is an integer number (4240813122).

Almost surely, 2^21002122102 is an apocalyptic number.

21002122102 is a deficient number, since it is larger than the sum of its proper divisors (12924382874).

21002122102 is a wasteful number, since it uses less digits than its factorization.

21002122102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807773942.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002122102 its reverse (20122120012), we get a palindrome (41124242114).

The spelling of 21002122102 in words is "twenty-one billion, two million, one hundred twenty-two thousand, one hundred two".