1621142252 has 24 divisors (see below), whose sum is σ = 2877940800. Its totient is φ = 798909696.

The previous prime is 1621142239. The next prime is 1621142267. The reversal of 1621142252 is 2522411261.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189524 + ... + 197892.

It is an arithmetic number, because the mean of its divisors is an integer number (119914200).

Almost surely, 2^1621142252 is an apocalyptic number.

It is an amenable number.

1621142252 is a deficient number, since it is larger than the sum of its proper divisors (1256798548).

1621142252 is a wasteful number, since it uses less digits than its factorization.

1621142252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9065 (or 9063 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 1621142252 is about 40263.4108341556. The cubic root of 1621142252 is about 1174.7362624000.

The spelling of 1621142252 in words is "one billion, six hundred twenty-one million, one hundred forty-two thousand, two hundred fifty-two".