121403256890 has 16 divisors (see below), whose sum is σ = 219789020808. Its totient is φ = 48280600896.

The previous prime is 121403256869. The next prime is 121403256913. The reversal of 121403256890 is 98652304121.

It can be written as a sum of positive squares in 4 ways, for example, as 100594905889 + 20808351001 = 317167^2 + 144251^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35085917 + ... + 35089376.

Almost surely, 2^121403256890 is an apocalyptic number.

121403256890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121403256890 is a deficient number, since it is larger than the sum of its proper divisors (98385763918).

121403256890 is a wasteful number, since it uses less digits than its factorization.

121403256890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70175473.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 121403256890 in words is "one hundred twenty-one billion, four hundred three million, two hundred fifty-six thousand, eight hundred ninety".