1021641621 has 128 divisors (see below), whose sum is σ = 1916006400. Its totient is φ = 476985600.

The previous prime is 1021641583. The next prime is 1021641629. The reversal of 1021641621 is 1261461201.

It is a happy number.

1021641621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1021641621 - 2¹¹ = 1021639573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021641591 and 1021641600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021641629) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7798726 + ... + 7798856.

It is an arithmetic number, because the mean of its divisors is an integer number (14968800).

Almost surely, 2^1021641621 is an apocalyptic number.

1021641621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021641621 is a deficient number, since it is larger than the sum of its proper divisors (894364779).

1021641621 is a wasteful number, since it uses less digits than its factorization.

1021641621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1021641621 is about 31963.1290864959. The cubic root of 1021641621 is about 1007.1624504901.

The spelling of 1021641621 in words is "one billion, twenty-one million, six hundred forty-one thousand, six hundred twenty-one".