2121620721207 has 32 divisors (see below), whose sum is σ = 3082445150400. Its totient is φ = 1290266557440.

The previous prime is 2121620721197. The next prime is 2121620721229. The reversal of 2121620721207 is 7021270261212.

It is not a de Polignac number, because 2121620721207 - 2¹¹ = 2121620719159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121620721287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218107 + ... + 2071427.

It is an arithmetic number, because the mean of its divisors is an integer number (96326410950).

Almost surely, 2^{2121620721207} is an apocalyptic number.

2121620721207 is a deficient number, since it is larger than the sum of its proper divisors (960824429193).

2121620721207 is a wasteful number, since it uses less digits than its factorization.

2121620721207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853683.

The product of its (nonzero) digits is 9408, while the sum is 33.

Adding to 2121620721207 its reverse (7021270261212), we get a palindrome (9142890982419).

The spelling of 2121620721207 in words is "two trillion, one hundred twenty-one billion, six hundred twenty million, seven hundred twenty-one thousand, two hundred seven".