621212534421 has 16 divisors (see below), whose sum is σ = 864994521984. Its totient is φ = 395815235904.

The previous prime is 621212534401. The next prime is 621212534489. The reversal of 621212534421 is 124435212126.

It is not a de Polignac number, because 621212534421 - 2¹³ = 621212526229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621212534401) 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, 3553726 + ... + 3724431.

It is an arithmetic number, because the mean of its divisors is an integer number (54062157624).

Almost surely, 2^621212534421 is an apocalyptic number.

It is an amenable number.

621212534421 is a deficient number, since it is larger than the sum of its proper divisors (243781987563).

621212534421 is a wasteful number, since it uses less digits than its factorization.

621212534421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7279420.

The product of its digits is 23040, while the sum is 33.

Adding to 621212534421 its reverse (124435212126), we get a palindrome (745647746547).

The spelling of 621212534421 in words is "six hundred twenty-one billion, two hundred twelve million, five hundred thirty-four thousand, four hundred twenty-one".