200421551 has 8 divisors (see below), whose sum is σ = 231503184. Its totient is φ = 171483520.

The previous prime is 200421521. The next prime is 200421553. The reversal of 200421551 is 155124002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 200421551 - 2²² = 196227247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200421553) 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, 535700 + ... + 536073.

It is an arithmetic number, because the mean of its divisors is an integer number (28937898).

Almost surely, 2^200421551 is an apocalyptic number.

200421551 is a deficient number, since it is larger than the sum of its proper divisors (31081633).

200421551 is a wasteful number, since it uses less digits than its factorization.

200421551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071801.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 200421551 is about 14157.0318569960. The cubic root of 200421551 is about 585.2141335066.

Adding to 200421551 its reverse (155124002), we get a palindrome (355545553).

The spelling of 200421551 in words is "two hundred million, four hundred twenty-one thousand, five hundred fifty-one".