21020000120220 has 24 divisors (see below), whose sum is σ = 58856000336784. Its totient is φ = 5605333365376.

The previous prime is 21020000120213. The next prime is 21020000120263. The reversal of 21020000120220 is 2202100002012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21020000120196 and 21020000120205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175166667609 + ... + 175166667728.

It is an arithmetic number, because the mean of its divisors is an integer number (2452333347366).

Almost surely, 2^{21020000120220} is an apocalyptic number.

21020000120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020000120220 is an abundant number, since it is smaller than the sum of its proper divisors (37836000216564).

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

21020000120220 is a wasteful number, since it uses less digits than its factorization.

21020000120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350333335349 (or 350333335347 counting only the distinct ones).

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

Adding to 21020000120220 its reverse (2202100002012), we get a palindrome (23222100122232).

The spelling of 21020000120220 in words is "twenty-one trillion, twenty billion, one hundred twenty thousand, two hundred twenty".