621101023 has 4 divisors (see below), whose sum is σ = 621570400. Its totient is φ = 620631648.

The previous prime is 621101017. The next prime is 621101053. The reversal of 621101023 is 320101126.

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 621101023 - 2²¹ = 619003871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621100988 and 621101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621101053) 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, 232698 + ... + 235351.

It is an arithmetic number, because the mean of its divisors is an integer number (155392600).

Almost surely, 2^621101023 is an apocalyptic number.

621101023 is a deficient number, since it is larger than the sum of its proper divisors (469377).

621101023 is a wasteful number, since it uses less digits than its factorization.

621101023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469376.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 621101023 is about 24921.8984629984. The cubic root of 621101023 is about 853.2063548889.

Adding to 621101023 its reverse (320101126), we get a palindrome (941202149).

The spelling of 621101023 in words is "six hundred twenty-one million, one hundred one thousand, twenty-three".