72121212120002 has 4 divisors (see below), whose sum is σ = 108181818180006. Its totient is φ = 36060606060000.

The previous prime is 72121212119977. The next prime is 72121212120011. The reversal of 72121212120002 is 20002121212127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 71542348309441 + 578863810561 = 8458271^2 + 760831^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72121212120002.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18030303029999 + ... + 18030303030002.

Almost surely, 2^{72121212120002} is an apocalyptic number.

72121212120002 is a deficient number, since it is larger than the sum of its proper divisors (36060606060004).

72121212120002 is a wasteful number, since it uses less digits than its factorization.

72121212120002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36060606060003.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 72121212120002 its reverse (20002121212127), we get a palindrome (92123333332129).

The spelling of 72121212120002 in words is "seventy-two trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, two".