1012621520 has 40 divisors (see below), whose sum is σ = 2355682560. Its totient is φ = 404818560.

The previous prime is 1012621499. The next prime is 1012621523. The reversal of 1012621520 is 251262101.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1012621520² = 2050804685534220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1012621492 and 1012621501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012621523) 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, 244265 + ... + 248375.

It is an arithmetic number, because the mean of its divisors is an integer number (58892064).

Almost surely, 2^1012621520 is an apocalyptic number.

1012621520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012621520 is an abundant number, since it is smaller than the sum of its proper divisors (1343061040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1012621520 is a wasteful number, since it uses less digits than its factorization.

1012621520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7203 (or 7197 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1012621520 is about 31821.7145986825. The cubic root of 1012621520 is about 1004.1895961049.

Adding to 1012621520 its reverse (251262101), we get a palindrome (1263883621).

The spelling of 1012621520 in words is "one billion, twelve million, six hundred twenty-one thousand, five hundred twenty".