121037221872 has 240 divisors, whose sum is σ = 406172416000. Its totient is φ = 32917363200.

The previous prime is 121037221829. The next prime is 121037221891. The reversal of 121037221872 is 278122730121.

It is a happy number.

121037221872 is a `hidden beast` number, since 1 + 2 + 1 + 0 + 372 + 218 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1874379 + ... + 1937877.

Almost surely, 2^121037221872 is an apocalyptic number.

121037221872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121037221872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203086208000).

121037221872 is an abundant number, since it is smaller than the sum of its proper divisors (285135194128).

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

121037221872 is a wasteful number, since it uses less digits than its factorization.

121037221872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63612 (or 63603 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

Adding to 121037221872 its reverse (278122730121), we get a palindrome (399159951993).

The spelling of 121037221872 in words is "one hundred twenty-one billion, thirty-seven million, two hundred twenty-one thousand, eight hundred seventy-two".