1021650421 has 8 divisors (see below), whose sum is σ = 1138241664. Its totient is φ = 909011520.

The previous prime is 1021650397. The next prime is 1021650439. The reversal of 1021650421 is 1240561201.

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 1021650421 - 2¹⁷ = 1021519349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021650392 and 1021650401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021650521) 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, 987540 + ... + 988573.

It is an arithmetic number, because the mean of its divisors is an integer number (142280208).

Almost surely, 2^1021650421 is an apocalyptic number.

1021650421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021650421 is a deficient number, since it is larger than the sum of its proper divisors (116591243).

1021650421 is a wasteful number, since it uses less digits than its factorization.

1021650421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976171.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1021650421 is about 31963.2667448119. The cubic root of 1021650421 is about 1007.1653422426.

The spelling of 1021650421 in words is "one billion, twenty-one million, six hundred fifty thousand, four hundred twenty-one".