4240202421 has 32 divisors (see below), whose sum is σ = 7260825600. Its totient is φ = 2139344064.

The previous prime is 4240202399. The next prime is 4240202443. The reversal of 4240202421 is 1242020424.

It is an interprime number because it is at equal distance from previous prime (4240202399) and next prime (4240202443).

It is not a de Polignac number, because 4240202421 - 2⁵ = 4240202389 is a prime.

It is a super-2 number, since 2×4240202421² = 35958633142108522482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4240202221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 331371 + ... + 343928.

It is an arithmetic number, because the mean of its divisors is an integer number (226900800).

Almost surely, 2^4240202421 is an apocalyptic number.

It is an amenable number.

4240202421 is a deficient number, since it is larger than the sum of its proper divisors (3020623179).

4240202421 is a wasteful number, since it uses less digits than its factorization.

4240202421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675345.

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 4240202421 is about 65116.8366937461. The cubic root of 4240202421 is about 1618.5602232145.

Adding to 4240202421 its reverse (1242020424), we get a palindrome (5482222845).

The spelling of 4240202421 in words is "four billion, two hundred forty million, two hundred two thousand, four hundred twenty-one".