121381972 has 12 divisors (see below), whose sum is σ = 224913780. Its totient is φ = 57120896.

The previous prime is 121381961. The next prime is 121381979. The reversal of 121381972 is 279183121.

It can be written as a sum of positive squares in 2 ways, for example, as 107868996 + 13512976 = 10386^2 + 3676^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121381979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892447 + ... + 892582.

It is an arithmetic number, because the mean of its divisors is an integer number (18742815).

Almost surely, 2^121381972 is an apocalyptic number.

It is an amenable number.

121381972 is a deficient number, since it is larger than the sum of its proper divisors (103531808).

121381972 is a wasteful number, since it uses less digits than its factorization.

121381972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785050 (or 1785048 counting only the distinct ones).

The product of its digits is 6048, while the sum is 34.

The square root of 121381972 is about 11017.3486828728. The cubic root of 121381972 is about 495.1286568272.

The spelling of 121381972 in words is "one hundred twenty-one million, three hundred eighty-one thousand, nine hundred seventy-two".