1621355113111 has 4 divisors (see below), whose sum is σ = 1716728943312. Its totient is φ = 1525981282912.

The previous prime is 1621355113097. The next prime is 1621355113117. The reversal of 1621355113111 is 1113115531261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1621355113111 - 2⁹ = 1621355112599 is a prime.

It is a super-2 number, since 2×1621355113111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621355113117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47686915075 + ... + 47686915108.

It is an arithmetic number, because the mean of its divisors is an integer number (429182235828).

Almost surely, 2^{1621355113111} is an apocalyptic number.

1621355113111 is a deficient number, since it is larger than the sum of its proper divisors (95373830201).

1621355113111 is an equidigital number, since it uses as much as digits as its factorization.

1621355113111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95373830200.

The product of its digits is 2700, while the sum is 31.

The spelling of 1621355113111 in words is "one trillion, six hundred twenty-one billion, three hundred fifty-five million, one hundred thirteen thousand, one hundred eleven".