1021210121200 has 120 divisors (see below), whose sum is σ = 2629078321968. Its totient is φ = 379823370240.

The previous prime is 1021210121123. The next prime is 1021210121209. The reversal of 1021210121200 is 21210121201.

It is a super-2 number, since 2×1021210121200² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021210121209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 340287 + ... + 1469086.

Almost surely, 2^{1021210121200} is an apocalyptic number.

1021210121200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021210121200 is an abundant number, since it is smaller than the sum of its proper divisors (1607868200768).

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

1021210121200 is a wasteful number, since it uses less digits than its factorization.

1021210121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809491 (or 1809480 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1021210121200 its reverse (21210121201), we get a palindrome (1042420242401).

Subtracting from 1021210121200 its reverse (21210121201), we obtain a palindrome (999999999999).

The spelling of 1021210121200 in words is "one trillion, twenty-one billion, two hundred ten million, one hundred twenty-one thousand, two hundred".