12420540621 has 8 divisors (see below), whose sum is σ = 18400800960. Its totient is φ = 8280360396.

The previous prime is 12420540611. The next prime is 12420540679. The reversal of 12420540621 is 12604502421.

12420540621 is a `hidden beast` number, since 12 + 4 + 20 + 5 + 4 + 0 + 621 = 666.

It is not a de Polignac number, because 12420540621 - 2¹³ = 12420532429 is a prime.

It is a super-2 number, since 2×12420540621² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 460020023 = 12420540621 / (1 + 2 + 4 + 2 + 0 + 5 + 4 + 0 + 6 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420540611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230009985 + ... + 230010038.

It is an arithmetic number, because the mean of its divisors is an integer number (2300100120).

Almost surely, 2^12420540621 is an apocalyptic number.

It is an amenable number.

12420540621 is a deficient number, since it is larger than the sum of its proper divisors (5980260339).

12420540621 is an equidigital number, since it uses as much as digits as its factorization.

12420540621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460020032 (or 460020026 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The spelling of 12420540621 in words is "twelve billion, four hundred twenty million, five hundred forty thousand, six hundred twenty-one".