121420072 has 8 divisors (see below), whose sum is σ = 227662650. Its totient is φ = 60710032.

The previous prime is 121420043. The next prime is 121420109. The reversal of 121420072 is 270024121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 100681156 + 20738916 = 10034^2 + 4554^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7588747 + ... + 7588762.

Almost surely, 2^121420072 is an apocalyptic number.

It is an amenable number.

121420072 is a deficient number, since it is larger than the sum of its proper divisors (106242578).

121420072 is a wasteful number, since it uses less digits than its factorization.

121420072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15177515 (or 15177511 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 121420072 is about 11019.0776383507. The cubic root of 121420072 is about 495.1804559209.

Adding to 121420072 its reverse (270024121), we get a palindrome (391444193).

The spelling of 121420072 in words is "one hundred twenty-one million, four hundred twenty thousand, seventy-two".