21220122000 has 640 divisors, whose sum is σ = 89048014848. Its totient is φ = 4215552000.

The previous prime is 21220121971. The next prime is 21220122029. The reversal of 21220122000 is 22102212.

It is an interprime number because it is at equal distance from previous prime (21220121971) and next prime (21220122029).

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 127 ways as a sum of consecutive naturals, for example, 10625002 + ... + 10626998.

Almost surely, 2^21220122000 is an apocalyptic number.

21220122000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44524007424).

21220122000 is an abundant number, since it is smaller than the sum of its proper divisors (67827892848).

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

21220122000 is a wasteful number, since it uses less digits than its factorization.

21220122000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064 (or 2048 counting only the distinct ones).

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

Adding to 21220122000 its reverse (22102212), we get a palindrome (21242224212).

The spelling of 21220122000 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-two thousand".