121220231000 has 128 divisors (see below), whose sum is σ = 316990739520. Its totient is φ = 43004800000.

The previous prime is 121220230949. The next prime is 121220231003. The reversal of 121220231000 is 132022121.

It is a happy number.

It is a super-2 number, since 2×121220231000² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220231003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 316610 + ... + 585390.

Almost surely, 2^121220231000 is an apocalyptic number.

121220231000 is a gapful number since it is divisible by the number (10) 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 121220231000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158495369760).

121220231000 is an abundant number, since it is smaller than the sum of its proper divisors (195770508520).

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

121220231000 is a wasteful number, since it uses less digits than its factorization.

121220231000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268854 (or 268840 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 121220231000 its reverse (132022121), we get a palindrome (121352253121).

The spelling of 121220231000 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred thirty-one thousand".