7211998013 has 16 divisors (see below), whose sum is σ = 8220548736. Its totient is φ = 6263019840.

The previous prime is 7211997959. The next prime is 7211998037. The reversal of 7211998013 is 3108991127.

It is a happy number.

It is not a de Polignac number, because 7211998013 - 2¹² = 7211993917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7211995013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177131 + ... + 214007.

It is an arithmetic number, because the mean of its divisors is an integer number (513784296).

Almost surely, 2^7211998013 is an apocalyptic number.

It is an amenable number.

7211998013 is a deficient number, since it is larger than the sum of its proper divisors (1008550723).

7211998013 is a wasteful number, since it uses less digits than its factorization.

7211998013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37684.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 7211998013 is about 84923.4832834829. The cubic root of 7211998013 is about 1932.0507623292.

The spelling of 7211998013 in words is "seven billion, two hundred eleven million, nine hundred ninety-eight thousand, thirteen".