1521421000 has 64 divisors (see below), whose sum is σ = 3883800960. Its totient is φ = 553240000.

The previous prime is 1521420977. The next prime is 1521421049. The reversal of 1521421000 is 1241251.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58156 + ... + 80155.

It is an arithmetic number, because the mean of its divisors is an integer number (60684390).

Almost surely, 2^1521421000 is an apocalyptic number.

1521421000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521421000 is an abundant number, since it is smaller than the sum of its proper divisors (2362379960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1521421000 is a wasteful number, since it uses less digits than its factorization.

1521421000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138343 (or 138329 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1521421000 is about 39005.3970624579. The cubic root of 1521421000 is about 1150.1376016822.

Adding to 1521421000 its reverse (1241251), we get a palindrome (1522662251).

The spelling of 1521421000 in words is "one billion, five hundred twenty-one million, four hundred twenty-one thousand".