121012021000 has 64 divisors (see below), whose sum is σ = 304950325680. Its totient is φ = 44681356800.

The previous prime is 121012020973. The next prime is 121012021007. The reversal of 121012021000 is 120210121.

It can be written as a sum of positive squares in 8 ways, for example, as 16311887524 + 104700133476 = 127718^2 + 323574^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (121012021007) 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, 4641309 + ... + 4667308.

Almost surely, 2^121012021000 is an apocalyptic number.

121012021000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121012021000 is an abundant number, since it is smaller than the sum of its proper divisors (183938304680).

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

121012021000 is a wasteful number, since it uses less digits than its factorization.

121012021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9308651 (or 9308637 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121012021000 its reverse (120210121), we get a palindrome (121132231121).

The spelling of 121012021000 in words is "one hundred twenty-one billion, twelve million, twenty-one thousand".