1021220201000 has 64 divisors (see below), whose sum is σ = 2445228751680. Its totient is φ = 398988340800.

The previous prime is 1021220200991. The next prime is 1021220201003. The reversal of 1021220201000 is 1020221201.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1021220201003) 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, 11831654 + ... + 11917653.

It is an arithmetic number, because the mean of its divisors is an integer number (38206699245).

Almost surely, 2^{1021220201000} is an apocalyptic number.

1021220201000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021220201000 is an abundant number, since it is smaller than the sum of its proper divisors (1424008550680).

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

1021220201000 is a wasteful number, since it uses less digits than its factorization.

1021220201000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23749371 (or 23749357 counting only the distinct ones).

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

Adding to 1021220201000 its reverse (1020221201), we get a palindrome (1022240422201).

The spelling of 1021220201000 in words is "one trillion, twenty-one billion, two hundred twenty million, two hundred one thousand".