1021123870 has 64 divisors (see below), whose sum is σ = 2187077760. Its totient is φ = 339406848.

The previous prime is 1021123867. The next prime is 1021123871. The reversal of 1021123870 is 783211201.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021123871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40786 + ... + 60874.

It is an arithmetic number, because the mean of its divisors is an integer number (34173090).

Almost surely, 2^1021123870 is an apocalyptic number.

1021123870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021123870 is an abundant number, since it is smaller than the sum of its proper divisors (1165953890).

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

1021123870 is a wasteful number, since it uses less digits than its factorization.

1021123870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20149.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1021123870 is about 31955.0288687086. The cubic root of 1021123870 is about 1006.9922840087.

The spelling of 1021123870 in words is "one billion, twenty-one million, one hundred twenty-three thousand, eight hundred seventy".