21011001121202 has 4 divisors (see below), whose sum is σ = 31516501681806. Its totient is φ = 10505500560600.

The previous prime is 21011001121181. The next prime is 21011001121213. The reversal of 21011001121202 is 20212110011012.

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., 16526428303441 + 4484572817761 = 4065271^2 + 2117681^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252750280299 + ... + 5252750280302.

Almost surely, 2^{21011001121202} is an apocalyptic number.

21011001121202 is a deficient number, since it is larger than the sum of its proper divisors (10505500560604).

21011001121202 is a wasteful number, since it uses less digits than its factorization.

21011001121202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505500560603.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21011001121202 its reverse (20212110011012), we get a palindrome (41223111132214).

The spelling of 21011001121202 in words is "twenty-one trillion, eleven billion, one million, one hundred twenty-one thousand, two hundred two".