21223221000 has 64 divisors (see below), whose sum is σ = 66216458880. Its totient is φ = 5659524800.

The previous prime is 21223220987. The next prime is 21223221007. The reversal of 21223221000 is 12232212.

It is a happy number.

It is a super-2 number, since 2×21223221000² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21223221007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3534204 + ... + 3540203.

It is an arithmetic number, because the mean of its divisors is an integer number (1034632170).

Almost surely, 2^21223221000 is an apocalyptic number.

21223221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223221000 is an abundant number, since it is smaller than the sum of its proper divisors (44993237880).

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

21223221000 is a wasteful number, since it uses less digits than its factorization.

21223221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7074431 (or 7074417 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21223221000 its reverse (12232212), we get a palindrome (21235453212).

The spelling of 21223221000 in words is "twenty-one billion, two hundred twenty-three million, two hundred twenty-one thousand".