121421240010 has 144 divisors (see below), whose sum is σ = 372410618112. Its totient is φ = 27362462400.

The previous prime is 121421239957. The next prime is 121421240023. The reversal of 121421240010 is 10042124121.

121421240010 is a `hidden beast` number, since 1 + 2 + 1 + 421 + 240 + 0 + 1 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 119215 + ... + 507005.

It is an arithmetic number, because the mean of its divisors is an integer number (2586184848).

Almost surely, 2^121421240010 is an apocalyptic number.

121421240010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121421240010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186205309056).

121421240010 is an abundant number, since it is smaller than the sum of its proper divisors (250989378102).

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

121421240010 is a wasteful number, since it uses less digits than its factorization.

121421240010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387889 (or 387879 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121421240010 its reverse (10042124121), we get a palindrome (131463364131).

The spelling of 121421240010 in words is "one hundred twenty-one billion, four hundred twenty-one million, two hundred forty thousand, ten".