21022012102 has 32 divisors (see below), whose sum is σ = 38826994752. Its totient is φ = 8312730624.

The previous prime is 21022012097. The next prime is 21022012103. The reversal of 21022012102 is 20121022012.

It is a happy number.

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 (21022012103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408318 + ... + 456910.

It is an arithmetic number, because the mean of its divisors is an integer number (1213343586).

Almost surely, 2^21022012102 is an apocalyptic number.

21022012102 is a deficient number, since it is larger than the sum of its proper divisors (17804982650).

21022012102 is a wasteful number, since it uses less digits than its factorization.

21022012102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50992.

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

Adding to 21022012102 its reverse (20121022012), we get a palindrome (41143034114).

The spelling of 21022012102 in words is "twenty-one billion, twenty-two million, twelve thousand, one hundred two".