201621100611 has 12 divisors (see below), whose sum is σ = 312718441992. Its totient is φ = 115212057408.

The previous prime is 201621100591. The next prime is 201621100613. The reversal of 201621100611 is 116001126102.

It is not a de Polignac number, because 201621100611 - 2¹⁴ = 201621084227 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (201621100613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 685785910 + ... + 685786203.

It is an arithmetic number, because the mean of its divisors is an integer number (26059870166).

Almost surely, 2^201621100611 is an apocalyptic number.

201621100611 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

201621100611 is a deficient number, since it is larger than the sum of its proper divisors (111097341381).

201621100611 is a wasteful number, since it uses less digits than its factorization.

201621100611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371572130 (or 1371572123 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 201621100611 its reverse (116001126102), we get a palindrome (317622226713).

The spelling of 201621100611 in words is "two hundred one billion, six hundred twenty-one million, one hundred thousand, six hundred eleven".