21210222020102 has 4 divisors (see below), whose sum is σ = 31815333030156. Its totient is φ = 10605111010050.

The previous prime is 21210222020101. The next prime is 21210222020107. The reversal of 21210222020102 is 20102022201212.

It is a happy number.

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 (21210222020101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302555505024 + ... + 5302555505027.

It is an arithmetic number, because the mean of its divisors is an integer number (7953833257539).

Almost surely, 2^{21210222020102} is an apocalyptic number.

21210222020102 is a deficient number, since it is larger than the sum of its proper divisors (10605111010054).

21210222020102 is a wasteful number, since it uses less digits than its factorization.

21210222020102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605111010053.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21210222020102 its reverse (20102022201212), we get a palindrome (41312244221314).

The spelling of 21210222020102 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-two million, twenty thousand, one hundred two".