2021156511202 has 4 divisors (see below), whose sum is σ = 3031734766806. Its totient is φ = 1010578255600.

The previous prime is 2021156511181. The next prime is 2021156511203.

2021156511202 is nontrivially palindromic in base 10.

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., 1563072552441 + 458083958761 = 1250229^2 + 676819^2 .

It is not an unprimeable number, because it can be changed into a prime (2021156511203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505289127799 + ... + 505289127802.

Almost surely, 2^{2021156511202} is an apocalyptic number.

2021156511202 is a deficient number, since it is larger than the sum of its proper divisors (1010578255604).

2021156511202 is a wasteful number, since it uses less digits than its factorization.

2021156511202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010578255603.

The product of its (nonzero) digits is 2400, while the sum is 28.

The spelling of 2021156511202 in words is "two trillion, twenty-one billion, one hundred fifty-six million, five hundred eleven thousand, two hundred two".