21202221001020 has 24 divisors (see below), whose sum is σ = 59366218803024. Its totient is φ = 5653925600256.

The previous prime is 21202221000979. The next prime is 21202221001061. The reversal of 21202221001020 is 2010012220212.

It is an interprime number because it is at equal distance from previous prime (21202221000979) and next prime (21202221001061).

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 176685174949 + ... + 176685175068.

It is an arithmetic number, because the mean of its divisors is an integer number (2473592450126).

Almost surely, 2^{21202221001020} is an apocalyptic number.

21202221001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202221001020 is an abundant number, since it is smaller than the sum of its proper divisors (38163997802004).

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

21202221001020 is a wasteful number, since it uses less digits than its factorization.

21202221001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353370350029 (or 353370350027 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21202221001020 its reverse (2010012220212), we get a palindrome (23212233221232).

The spelling of 21202221001020 in words is "twenty-one trillion, two hundred two billion, two hundred twenty-one million, one thousand, twenty".