7421405551 has 4 divisors (see below), whose sum is σ = 8481606352. Its totient is φ = 6361204752.

The previous prime is 7421405527. The next prime is 7421405587. The reversal of 7421405551 is 1555041247.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555041247 = 23 ⋅67610489.

It is not a de Polignac number, because 7421405551 - 2²³ = 7413016943 is a prime.

It is a super-2 number, since 2×7421405551² (a number of 21 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 (7421435551) 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, 530100390 + ... + 530100403.

It is an arithmetic number, because the mean of its divisors is an integer number (2120401588).

Almost surely, 2^7421405551 is an apocalyptic number.

7421405551 is a deficient number, since it is larger than the sum of its proper divisors (1060200801).

7421405551 is a wasteful number, since it uses less digits than its factorization.

7421405551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060200800.

The product of its (nonzero) digits is 28000, while the sum is 34.

The square root of 7421405551 is about 86147.5800646774. The cubic root of 7421405551 is about 1950.5723107347.

Adding to 7421405551 its reverse (1555041247), we get a palindrome (8976446798).

The spelling of 7421405551 in words is "seven billion, four hundred twenty-one million, four hundred five thousand, five hundred fifty-one".