20155121507002 has 4 divisors (see below), whose sum is σ = 30232682260506. Its totient is φ = 10077560753500.

The previous prime is 20155121506981. The next prime is 20155121507051. The reversal of 20155121507002 is 20070512155102.

It is a happy number.

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., 20056254653241 + 98866853761 = 4478421^2 + 314431^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5038780376749 + ... + 5038780376752.

Almost surely, 2^{20155121507002} is an apocalyptic number.

20155121507002 is a deficient number, since it is larger than the sum of its proper divisors (10077560753504).

20155121507002 is a wasteful number, since it uses less digits than its factorization.

20155121507002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10077560753503.

The product of its (nonzero) digits is 7000, while the sum is 31.

The spelling of 20155121507002 in words is "twenty trillion, one hundred fifty-five billion, one hundred twenty-one million, five hundred seven thousand, two".