121211021000 has 32 divisors (see below), whose sum is σ = 283633791480. Its totient is φ = 48484408000.

The previous prime is 121211020981. The next prime is 121211021011. The reversal of 121211021000 is 120112121.

It can be written as a sum of positive squares in 4 ways, for example, as 64224737476 + 56986283524 = 253426^2 + 238718^2 .

It is a super-2 number, since 2×121211021000² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60604511 + ... + 60606510.

Almost surely, 2^121211021000 is an apocalyptic number.

121211021000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211021000 is an abundant number, since it is smaller than the sum of its proper divisors (162422770480).

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

121211021000 is a wasteful number, since it uses less digits than its factorization.

121211021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121211042 (or 121211028 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121211021000 its reverse (120112121), we get a palindrome (121331133121).

The spelling of 121211021000 in words is "one hundred twenty-one billion, two hundred eleven million, twenty-one thousand".