20021213102 has 16 divisors (see below), whose sum is σ = 34486300800. Its totient is φ = 8621574840.

The previous prime is 20021213077. The next prime is 20021213129. The reversal of 20021213102 is 20131212002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23948402 + ... + 23949237.

It is an arithmetic number, because the mean of its divisors is an integer number (2155393800).

Almost surely, 2^20021213102 is an apocalyptic number.

20021213102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20021213102 is a deficient number, since it is larger than the sum of its proper divisors (14465087698).

20021213102 is a wasteful number, since it uses less digits than its factorization.

20021213102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47897671.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20021213102 its reverse (20131212002), we get a palindrome (40152425104).

The spelling of 20021213102 in words is "twenty billion, twenty-one million, two hundred thirteen thousand, one hundred two".