621021143 has 4 divisors (see below), whose sum is σ = 623215848. Its totient is φ = 618826440.

The previous prime is 621021139. The next prime is 621021211. The reversal of 621021143 is 341120126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341120126 = 2 ⋅170560063.

It is a cyclic number.

It is not a de Polignac number, because 621021143 - 2² = 621021139 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 (621021103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1096928 + ... + 1097493.

It is an arithmetic number, because the mean of its divisors is an integer number (155803962).

Almost surely, 2^621021143 is an apocalyptic number.

621021143 is a deficient number, since it is larger than the sum of its proper divisors (2194705).

621021143 is a wasteful number, since it uses less digits than its factorization.

621021143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194704.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 621021143 is about 24920.2958048254. The cubic root of 621021143 is about 853.1697762739.

Adding to 621021143 its reverse (341120126), we get a palindrome (962141269).

The spelling of 621021143 in words is "six hundred twenty-one million, twenty-one thousand, one hundred forty-three".