21010200221000 has 64 divisors (see below), whose sum is σ = 49167727230960. Its totient is φ = 8403420480000.

The previous prime is 21010200220957. The next prime is 21010200221053. The reversal of 21010200221000 is 12200201012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1980870464356 + 19029329756644 = 1407434^2 + 4362262^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12022910 + ... + 13659090.

Almost surely, 2^{21010200221000} is an apocalyptic number.

21010200221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010200221000 is an abundant number, since it is smaller than the sum of its proper divisors (28157527009960).

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

21010200221000 is a wasteful number, since it uses less digits than its factorization.

21010200221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649043 (or 1649029 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21010200221000 its reverse (12200201012), we get a palindrome (21022400422012).

The spelling of 21010200221000 in words is "twenty-one trillion, ten billion, two hundred million, two hundred twenty-one thousand".