121835142490 has 32 divisors (see below), whose sum is σ = 226888782480. Its totient is φ = 47048730624.

The previous prime is 121835142487. The next prime is 121835142491. The reversal of 121835142490 is 94241538121.

It can be written as a sum of positive squares in 8 ways, for example, as 49782088161 + 72053054329 = 223119^2 + 268427^2 .

It is not an unprimeable number, because it can be changed into a prime (121835142491) 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, 4264132 + ... + 4292608.

Almost surely, 2^121835142490 is an apocalyptic number.

121835142490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121835142490 is a deficient number, since it is larger than the sum of its proper divisors (105053639990).

121835142490 is a wasteful number, since it uses less digits than its factorization.

121835142490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43266.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 121835142490 in words is "one hundred twenty-one billion, eight hundred thirty-five million, one hundred forty-two thousand, four hundred ninety".