21020101221000 has 128 divisors (see below), whose sum is σ = 74951675285760. Its totient is φ = 4804594560000.

The previous prime is 21020101220983. The next prime is 21020101221047. The reversal of 21020101221000 is 12210102012.

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

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, 500457601 + ... + 500499600.

It is an arithmetic number, because the mean of its divisors is an integer number (585559963170).

Almost surely, 2^{21020101221000} is an apocalyptic number.

21020101221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020101221000 is an abundant number, since it is smaller than the sum of its proper divisors (53931574064760).

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

21020101221000 is a wasteful number, since it uses less digits than its factorization.

21020101221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000957232 (or 1000957218 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020101221000 its reverse (12210102012), we get a palindrome (21032311323012).

It can be divided in two parts, 210201012 and 21000, that added together give a palindrome (210222012).

The spelling of 21020101221000 in words is "twenty-one trillion, twenty billion, one hundred one million, two hundred twenty-one thousand".