10221021356420 has 36 divisors (see below), whose sum is σ = 24968495030220. Its totient is φ = 3504350179008.

The previous prime is 10221021356411. The next prime is 10221021356423. The reversal of 10221021356420 is 2465312012201.

It can be written as a sum of positive squares in 2 ways, for example, as 4063804428544 + 6157216927876 = 2015888^2 + 2481374^2 .

It is not an unprimeable number, because it can be changed into a prime (10221021356423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5214805835 + ... + 5214807794.

It is an arithmetic number, because the mean of its divisors is an integer number (693569306395).

Almost surely, 2^{10221021356420} is an apocalyptic number.

10221021356420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10221021356420 is an abundant number, since it is smaller than the sum of its proper divisors (14747473673800).

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

10221021356420 is a wasteful number, since it uses less digits than its factorization.

10221021356420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10429613652 (or 10429613643 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 10221021356420 its reverse (2465312012201), we get a palindrome (12686333368621).

The spelling of 10221021356420 in words is "ten trillion, two hundred twenty-one billion, twenty-one million, three hundred fifty-six thousand, four hundred twenty".