542202421 has 4 divisors (see below), whose sum is σ = 543765312. Its totient is φ = 540639532.

The previous prime is 542202413. The next prime is 542202433. The reversal of 542202421 is 124202245.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124202245 = 5 ⋅24840449.

It is a cyclic number.

It is not a de Polignac number, because 542202421 - 2³ = 542202413 is a prime.

It is a super-2 number, since 2×542202421² = 587966930676522482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 542202392 and 542202401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542202461) 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, 780925 + ... + 781618.

It is an arithmetic number, because the mean of its divisors is an integer number (135941328).

Almost surely, 2^542202421 is an apocalyptic number.

It is an amenable number.

542202421 is a deficient number, since it is larger than the sum of its proper divisors (1562891).

542202421 is a wasteful number, since it uses less digits than its factorization.

542202421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562890.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 542202421 is about 23285.2404110415. The cubic root of 542202421 is about 815.4308740762.

Adding to 542202421 its reverse (124202245), we get a palindrome (666404666).

The spelling of 542202421 in words is "five hundred forty-two million, two hundred two thousand, four hundred twenty-one".