1621022051 has 4 divisors (see below), whose sum is σ = 1768387704. Its totient is φ = 1473656400.

The previous prime is 1621022033. The next prime is 1621022089. The reversal of 1621022051 is 1502201261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1502201261 = 11 ⋅136563751.

It is a cyclic number.

It is not a de Polignac number, because 1621022051 - 2¹⁴ = 1621005667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621022021) 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, 73682810 + ... + 73682831.

It is an arithmetic number, because the mean of its divisors is an integer number (442096926).

Almost surely, 2^1621022051 is an apocalyptic number.

1621022051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1621022051 is a deficient number, since it is larger than the sum of its proper divisors (147365653).

1621022051 is a wasteful number, since it uses less digits than its factorization.

1621022051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147365652.

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

The square root of 1621022051 is about 40261.9181237059. The cubic root of 1621022051 is about 1174.7072277357.

The spelling of 1621022051 in words is "one billion, six hundred twenty-one million, twenty-two thousand, fifty-one".