1023401821 has 8 divisors (see below), whose sum is σ = 1112426784. Its totient is φ = 935848560.

The previous prime is 1023401809. The next prime is 1023401839. The reversal of 1023401821 is 1281043201.

It is a happy number.

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 1023401821 - 2¹³ = 1023393629 is a prime.

It is a super-2 number, since 2×1023401821² = 2094702574452232082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1023401792 and 1023401801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023401021) 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, 366475 + ... + 369256.

It is an arithmetic number, because the mean of its divisors is an integer number (139053348).

Almost surely, 2^1023401821 is an apocalyptic number.

It is an amenable number.

1023401821 is a deficient number, since it is larger than the sum of its proper divisors (89024963).

1023401821 is a wasteful number, since it uses less digits than its factorization.

1023401821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735851.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1023401821 is about 31990.6520877584. The cubic root of 1023401821 is about 1007.7405365009.

The spelling of 1023401821 in words is "one billion, twenty-three million, four hundred one thousand, eight hundred twenty-one".