20021121202102 has 16 divisors (see below), whose sum is σ = 30211822382112. Its totient is φ = 9950514972480.

The previous prime is 20021121202091. The next prime is 20021121202109. The reversal of 20021121202102 is 20120212112002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021121202109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40278202 + ... + 40772242.

It is an arithmetic number, because the mean of its divisors is an integer number (1888238898882).

Almost surely, 2^{20021121202102} is an apocalyptic number.

20021121202102 is a deficient number, since it is larger than the sum of its proper divisors (10190701180010).

20021121202102 is a wasteful number, since it uses less digits than its factorization.

20021121202102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615543.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20021121202102 its reverse (20120212112002), we get a palindrome (40141333314104).

The spelling of 20021121202102 in words is "twenty trillion, twenty-one billion, one hundred twenty-one million, two hundred two thousand, one hundred two".