21020220121002 has 16 divisors (see below), whose sum is σ = 42071194055232. Its totient is φ = 7001614404800.

The previous prime is 21020220120973. The next prime is 21020220121003. The reversal of 21020220121002 is 20012102202012.

It is a super-3 number, since 3×21020220121002³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020220121003) 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 in 7 ways as a sum of consecutive naturals, for example, 1281399999 + ... + 1281416402.

It is an arithmetic number, because the mean of its divisors is an integer number (2629449628452).

Almost surely, 2^{21020220121002} is an apocalyptic number.

21020220121002 is an abundant number, since it is smaller than the sum of its proper divisors (21050973934230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020220121002 is a wasteful number, since it uses less digits than its factorization.

21020220121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562817773.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21020220121002 its reverse (20012102202012), we get a palindrome (41032322323014).

The spelling of 21020220121002 in words is "twenty-one trillion, twenty billion, two hundred twenty million, one hundred twenty-one thousand, two".