101221220000 has 60 divisors (see below), whose sum is σ = 249019433586. Its totient is φ = 40488480000.

The previous prime is 101221219901. The next prime is 101221220047. The reversal of 101221220000 is 22122101.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 993258256 + 100227961744 = 31516^2 + 316588^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2510531 + ... + 2550530.

Almost surely, 2^101221220000 is an apocalyptic number.

101221220000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101221220000 is an abundant number, since it is smaller than the sum of its proper divisors (147798213586).

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

101221220000 is an frugal number, since it uses more digits than its factorization.

101221220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5061091 (or 5061068 counting only the distinct ones).

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

Adding to 101221220000 its reverse (22122101), we get a palindrome (101243342101).

The spelling of 101221220000 in words is "one hundred one billion, two hundred twenty-one million, two hundred twenty thousand".