21020120002002 has 64 divisors (see below), whose sum is σ = 46553727559680. Its totient is φ = 6274215446400.

The previous prime is 21020120001943. The next prime is 21020120002019. The reversal of 21020120002002 is 20020002102012.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5258374 + ... + 8348097.

It is an arithmetic number, because the mean of its divisors is an integer number (727401993120).

Almost surely, 2^{21020120002002} is an apocalyptic number.

21020120002002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21020120002002 is an abundant number, since it is smaller than the sum of its proper divisors (25533607557678).

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

21020120002002 is a wasteful number, since it uses less digits than its factorization.

21020120002002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13606839.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21020120002002 its reverse (20020002102012), we get a palindrome (41040122104014).

The spelling of 21020120002002 in words is "twenty-one trillion, twenty billion, one hundred twenty million, two thousand, two".