21120220202002 has 4 divisors (see below), whose sum is σ = 31680330303006. Its totient is φ = 10560110101000.

The previous prime is 21120220201979. The next prime is 21120220202017. The reversal of 21120220202002 is 20020202202112.

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., 13967478561481 + 7152741640521 = 3737309^2 + 2674461^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280055050499 + ... + 5280055050502.

Almost surely, 2^{21120220202002} is an apocalyptic number.

21120220202002 is a deficient number, since it is larger than the sum of its proper divisors (10560110101004).

21120220202002 is a wasteful number, since it uses less digits than its factorization.

21120220202002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560110101003.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21120220202002 its reverse (20020202202112), we get a palindrome (41140422404114).

The spelling of 21120220202002 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, two hundred two thousand, two".