1421501021 has 4 divisors (see below), whose sum is σ = 1421822592. Its totient is φ = 1421179452.

The previous prime is 1421500999. The next prime is 1421501051. The reversal of 1421501021 is 1201051241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421501021 is a prime.

It is a super-4 number, since 4×1421501021⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421501051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154061 + ... + 163026.

It is an arithmetic number, because the mean of its divisors is an integer number (355455648).

Almost surely, 2^1421501021 is an apocalyptic number.

It is an amenable number.

1421501021 is a deficient number, since it is larger than the sum of its proper divisors (321571).

1421501021 is an equidigital number, since it uses as much as digits as its factorization.

1421501021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321570.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1421501021 is about 37702.7985831291. The cubic root of 1421501021 is about 1124.3867659698.

Adding to 1421501021 its reverse (1201051241), we get a palindrome (2622552262).

The spelling of 1421501021 in words is "one billion, four hundred twenty-one million, five hundred one thousand, twenty-one".