20211212102 has 4 divisors (see below), whose sum is σ = 30316818156. Its totient is φ = 10105606050.

The previous prime is 20211212101. The next prime is 20211212123. The reversal of 20211212102 is 20121211202.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211212101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5052803024 + ... + 5052803027.

It is an arithmetic number, because the mean of its divisors is an integer number (7579204539).

Almost surely, 2^20211212102 is an apocalyptic number.

20211212102 is a deficient number, since it is larger than the sum of its proper divisors (10105606054).

20211212102 is a wasteful number, since it uses less digits than its factorization.

20211212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10105606053.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20211212102 its reverse (20121211202), we get a palindrome (40332423304).

The spelling of 20211212102 in words is "twenty billion, two hundred eleven million, two hundred twelve thousand, one hundred two".