1051553021 has 8 divisors (see below), whose sum is σ = 1090741080. Its totient is φ = 1012560192.

The previous prime is 1051553017. The next prime is 1051553039. The reversal of 1051553021 is 1203551501.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 143736121 + 907816900 = 11989^2 + 30130^2 .

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 1051553021 - 2² = 1051553017 is a prime.

It is a super-2 number, since 2×1051553021² = 2211527511948452882, which contains 22 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 (1011553021) 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, 37790 + ... + 59423.

It is an arithmetic number, because the mean of its divisors is an integer number (136342635).

Almost surely, 2^1051553021 is an apocalyptic number.

It is an amenable number.

1051553021 is a deficient number, since it is larger than the sum of its proper divisors (39188059).

1051553021 is an equidigital number, since it uses as much as digits as its factorization.

1051553021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97615.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 1051553021 is about 32427.6582719135. The cubic root of 1051553021 is about 1016.8972162741.

It can be divided in two parts, 10515 and 53021, that added together give a palindrome (63536).

The spelling of 1051553021 in words is "one billion, fifty-one million, five hundred fifty-three thousand, twenty-one".